RE: What's the inner scale on this photo for?

[Schechner, Sara]

Hi Steve,
The photo of the azimuth dial is hard to read.  I don't know what screws you 
are talking about preventing the arm from turning.  The arm is backwards at the 
moment since the pointed end should be on the scale of hour lines.  I am not 
convinced that there is a flap on the square end of the arm for a vane.  The 
sun at most angles would not fall far along the arm to reach the other end 
where the slot is.  Rather, I suspect there was a vertical gnomon in the slot 
at the pointed end.  Its shadow could have been aligned with the point so that 
the point was in line with the sun's azimuth.  As for the round dial, it almost 
always shows minutes and is geared to the rotation of the arm.  

That's my best guess.
Sara

-Original Message-
From: sundial  On Behalf Of Steve Lelievre
Sent: Monday, October 25, 2021 1:22 PM
To: Sundial List 
Subject: What's the inner scale on this photo for?

Hi,

Today a website called Vermont Free Press published an appallingly confusing 
(to me) summary of types of sundials. If you can bear to look, it's at 
https://www.vermontpressbureau.com/types-of-sundials/

However, there was one thing about it that piqued my interest: the photo of an 
azimuth sundial ( 
https://www.vermontpressbureau.com/wp-content/uploads/2021/10/Azimuthal.jpg
).

 From what I can make out, there is a metal flap at the end of the alidade / 
sighting arm (the end at top in the photo). It must get turned up to make a 
shadow-caster.  I guess the arm has to be rotated so that the shadow falls 
along it, and time is then read from where the right-hand edge of the arm 
crosses the net of hour and declination lines. But then, wouldn't the screws 
seen in the upper plate block the arm from being turned to the required 
orientation?

Another bit I can't figure is the little circular scale just north of the 
centre of the dial, with the pointer. Perhaps just an Equation of Time scale? 
Or perhaps a cam connects it to the arm so that it can be used to set the arm's 
length? (The slot in the arm suggests it can be slid in and out to set the tip 
at the applicable declination circle, which is a nifty feature.)

Cheers,

Steve

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RE: animation of shadow lengths and directions during day

[Schechner, Sara]

Thank you, everyone, who sent me links to various shadow animations!  I have 
had a lot of fun with them, and I shared them with the education office of the 
Harvard Museums of Science and Culture.  For their immediate needs, they rigged 
up something with a flashlight and a dinosaur figure.  It is not so precise, 
but makes the simple point to kids.

Best wishes,
Sara

From: sundial  On Behalf Of Schechner, Sara
Sent: Wednesday, June 02, 2021 6:21 PM
To: sundial@uni-koeln.de
Cc: Moon, Arielle Rebekah Ascrizzi 
Subject: animation of shadow lengths and directions during day

Hello,
I am looking for a simple animation of how the shadow of a vertical gnomon 
changes in length and direction during the course of the day from sunrise to 
noon to sunset.  Does anyone have one to recommend that could be used with a 
museum video.  Credit will, of course, be given.

Thank you!
Sara


Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/<https://urldefense.proofpoint.com/v1/url?u=http://www.altazimutharts.com/=AjZjj3dyY74kKL92lieHqQ%3D%3D%0A=Y3uaNkd%2BN%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0A=Ti1oQOLKwbdeBp0MOcYibsxY4Lg058dCGKYBaRLSNUY%3D%0A=2f04b2f3647abf5da1ada6decaf1b455ea2d0ead01efe881489e14a7d1adb139>

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu<mailto:sche...@fas.harvard.edu> |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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animation of shadow lengths and directions during day

[Schechner, Sara]

Hello,
I am looking for a simple animation of how the shadow of a vertical gnomon 
changes in length and direction during the course of the day from sunrise to 
noon to sunset.  Does anyone have one to recommend that could be used with a 
museum video.  Credit will, of course, be given.

Thank you!
Sara


Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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ICHA grants for early career scholars

[Schechner, Sara]

INTER-UNION COMMISSION OF HISTORY OF ASTRONOMY (ICHA)

The Inter-Union Commission of History of Astronomy (ICHA) is a joint commission 
of the International Union of History and Philosophy of Science and Technology 
(IUHPST)/ Division of History of Science and Technology and the International 
Astronomical Union (IAU).  ICHA receives financial support from the IUHPST and 
makes its home base in that Union.  Its connection to the IAU is through 
Commission C3 (History of Astronomy). 

Upcoming Meeting

ICHA will meet during the upcoming 26th International Congress of History of 
Science and Technology (26th ICHST), which will be held 25-31 July 2021 (now 
virtually) in Prague, Czech Republic.  Those interested in the history of 
astronomy are encouraged to check out the sessions organized by ICHA and the 
other Commissions.   The Congress program and registration instructions will be 
found at https://www.ichst2021.org/.  No formal membership is required to 
attend the Prague Congress or most of the subsidiary meetings, but registration 
is required.

GRANTS FOR EARLY CAREER SCHOLARS

The ICHA is pleased to announce that it has secured modest funds to help defray 
meeting costs for early career scholars wishing to attend the Prague Congress 
or other meetings relevant to the history of astronomy.  THIS INCLUDES MEETINGS 
OF SUNDIAL SOCIETIES.  Preference will be given to those presenting a paper or 
poster at the meeting.  

If you wish to apply for a grant, please send an application email to Sara 
Schechner, Secretary of ICHA (sche...@fas.harvard.edu) describing the meeting 
you wish to attend and your role in it.  The application process will be 
managed by the Organizing Committee of IAU Commission C3.  We will begin to 
review applications for 2021 on April 20 in order to enable applicants to take 
advantage of the early registration discount for the Prague Congress.  

Sara J. Schechner
Secretary, Inter-Union Commission of History of Astronomy
Secretary, International Astronomical Union Commission C3 (History of Astronomy)
---
Sara J. Schechner, PhD, FAAS 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344   
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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RE: sundial Digest, Vol 177, Issue 15 / Polish sundial maker G. I. Turasiewicz w Dobromilu

[Schechner, Sara]

Dear Darek and Maciej,

Thank you for your quick replies.  I know  that Dobromil is presently in 
Ukraine and not Poland, but the town has been associated with a number of 
different nations.  Before 1772, I believe it was part of Poland; after 1772, 
it was in the Galicia region of the Hapsburg Empire and associated with 
Austria.  In World War I, Dobromil returned to Poland.  In World War II, it was 
invaded by the Germans, and ended up in the Soviet Union.

It seemed to me that the sundial was signed in the Polish language.  Is that 
correct?

I will have a look at the catalogue of the collection of Przypkowski Museum in 
Jędrzejów.  Thank you for the reference.

Best wishes,
Sara


From: sundial  On Behalf Of Darek Oczki
Sent: Sunday, September 27, 2020 8:29 AM
To: sundial@uni-koeln.de
Subject: Odp: sundial Digest, Vol 177, Issue 15


Hi Sara.
Thank you for bringing this out. To be honest I have new encountered his name 
in any literature or article about dialing in Poland. It seems this name was 
never mentioned. I will do some research and try to find something. What is for 
sure is that Dobromil is a city in present Ukraine.
Best
Darek Oczki

Dnia 27 września 2020 12:00 napisał(a):
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Today's Topics:

 1. Polish sundial maker G. I.  Turasiewicz w Dobromilu
(Schechner, Sara)


--

Message: 1
Date: Sat, 26 Sep 2020 21:54:47 +
From: "Schechner, Sara" 
mailto:sche...@fas.harvard.edu>>
To: "sundial@uni-koeln.de<mailto:sundial@uni-koeln.de>" 
mailto:sundial@uni-koeln.de>>
Subject: Polish sundial maker G. I.  Turasiewicz w Dobromilu
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mailto:bl0pr07mb4019da20745c9220ed4f6213f8...@bl0pr07mb4019.namprd07.prod.outlook.com>>
Content-Type: text/plain; charset="us-ascii"

Dear Friends, especially those in Poland.

Harvard has an Augsburg-type sundial signed "G. I. Turasiewicz w Dobromilu."  I 
would like to know more about this maker.  If you know his full name, dates, 
and so forth, I would appreciate hearing from you.

Best wishes,

Sara

Sara J. Schechner, PhD, FAAS
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu<mailto:sche...@fas.harvard.edu<mailto:sche...@fas.harvard.edu%3cmailto:sche...@fas.harvard.edu>>
  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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Polish sundial maker G. I. Turasiewicz w Dobromilu

[Schechner, Sara]

Dear Friends, especially those in Poland.

Harvard has an Augsburg-type sundial signed "G. I. Turasiewicz w Dobromilu."  I 
would like to know more about this maker.  If you know his full name, dates, 
and so forth, I would appreciate hearing from you.

Best wishes,

Sara

Sara J. Schechner, PhD, FAAS
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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RE: Time problem

[Schechner, Sara]

There will be local customs but the technical time, taken from the Latin 
description of the hours is that Italian hours were counted from sunset and 
Babylonian hours from sunrise.  There is no mention of dusk.

Sara Schechner
Author of Time of Our Lives: Sundials at the Adler Planetarium

From: sundial  On Behalf Of Ross Sinclair Caldwell
Sent: Wednesday, July 01, 2020 11:04 AM
Cc: 'sundial list sundials' 
Subject: RE: Time problem


To find some authority for the understanding that the Italian hours begin at 
the end of dusk, or about half an hour after sunset, I note that in the BBS 
Sundial Glossary under "hour plane" - "Italian" it says -



"there is some evidence in older works that Italian hours were counted from 30 
minutes after sunset."

http://sundialsoc.org.uk/discussions/glossary-a-z/8/<https://urldefense.proofpoint.com/v2/url?u=http-3A__sundialsoc.org.uk_discussions_glossary-2Da-2Dz_8_=DwMF-g=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=UVmfG-Lwit5L4Etra9dngAhE7-_MBgKCK6nhJjl2zNk=Otrt5JkuLSHGmLmV5ku8B4qjZc9bNH8XXWwN7M-P4s4=>



Does anyone know what this evidence in older works is?



A few other places I've looked -



Wikipedia says "end of dusk, i.e. half an hour after sunset."

https://en.wikipedia.org/wiki/Hour<https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Hour=DwMF-g=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=UVmfG-Lwit5L4Etra9dngAhE7-_MBgKCK6nhJjl2zNk=e9M1Wr7ky9nfDOfVM5T1hGV6XkG6oMzk2v92ms6AwfQ=>



This looked promising - Mario Arnaldi, Le ore italiane. Origine e declino di 
uno dei più importanti sistemi orari del passato (prima parte).

https://www.academia.edu/2021250/Le_ore_italiane._Origine_e_declino_di_uno_dei_piu_importanti_sistemi_orari_del_passato_prima_parte_<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.academia.edu_2021250_Le-5Fore-5Fitaliane.-5FOrigine-5Fe-5Fdeclino-5Fdi-5Funo-5Fdei-5Fpiu-5Fimportanti-5Fsistemi-5Forari-5Fdel-5Fpassato-5Fprima-5Fparte-5F=DwMF-g=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=UVmfG-Lwit5L4Etra9dngAhE7-_MBgKCK6nhJjl2zNk=xS0qdc5Y2l8IIE79QlSnj2l2GWertLAFsRptNCGTxHk=>



But he does not mention the notion of "a half hour after" (mezz'ora dopo) 
sunset  (tramonto del sole).


Ross Caldwell
43.349399 3.22422981
Béziers, France



De : sundial 
mailto:sundial-boun...@uni-koeln.de>> de la part 
de Ross Sinclair Caldwell mailto:belmu...@hotmail.com>>
Envoyé : mercredi 1 juillet 2020 16:41
À : John Davis 
mailto:john.davi...@btopenworld.com>>; Schechner, 
Sara mailto:sche...@fas.harvard.edu>>
Cc : 'sundial list sundials' mailto:sundial@uni-koeln.de>>
Objet : RE: Time problem

Hi John, Sara et al.,
My understanding is that a seasonal (or unequal) hour is a period of time ('in 
the first hour' etc) and not an instant. It is never divided up into minutes 
and so the time of 6 minutes after dawn must be referring to a time in equal 
hours, most probably measured with an astrolabe as you suggest.
I agree. All that remains unknowable is the visibilty at the time. If it were 
overcast at dawn, they must have calculated rather than observed. But I tend to 
think it was observed, and determined with an astrolabe.

Ross

De : John Davis 
mailto:john.davi...@btopenworld.com>>
Envoyé : mercredi 1 juillet 2020 10:10
À : Ross Sinclair Caldwell mailto:belmu...@hotmail.com>>; 
Schechner, Sara mailto:sche...@fas.harvard.edu>>
Cc : 'sundial list sundials' mailto:sundial@uni-koeln.de>>
Objet : RE: Time problem

Hi Sara, Ross et al,



My understanding is that a seasonal (or unequal) hour is a period of time ('in 
the first hour' etc) and not an instant. It is never divided up into minutes 
and so the time of 6 minutes after dawn must be referring to a time in equal 
hours, most probably measured with an astrolabe as you suggest.



Regards,



John

---




-- Original Message --
From: "Schechner, Sara" 
mailto:sche...@fas.harvard.edu>>
To: "Ross Sinclair Caldwell" mailto:belmu...@hotmail.com>>
Cc: "'sundial list sundials'" 
mailto:sundial@uni-koeln.de>>
Sent: Tuesday, 30 Jun, 20 At 21:20
Subject: RE: Time problem

>>> In short, I am researching the biography of Filippo Maria Visconti 
>>> (1392-1447), duke of Milan, and you probably know that these Italian 
>>> princes relied heavily on astrology. So, Visconti's time of birth is known 
>>> precisely - "six minutes after sunrise," Monday, 23 September, 1392. His 
>>> natal chart was of course produced and interpreted, but it has been lost. I 
>>> am trying to recreate it as it might have been done by a court astrologer 
>>> of the time.<<<

I have some thoughts about

RE: Time problem

[Schechner, Sara]

>>> In short, I am researching the biography of Filippo Maria Visconti 
>>> (1392-1447), duke of Milan, and you probably know that these Italian 
>>> princes relied heavily on astrology. So, Visconti's time of birth is known 
>>> precisely - "six minutes after sunrise," Monday, 23 September, 1392. His 
>>> natal chart was of course produced and interpreted, but it has been lost. I 
>>> am trying to recreate it as it might have been done by a court astrologer 
>>> of the time.<<<

I have some thoughts about ascertaining the time of "6 minutes after sunrise" 
in 1392 in Milan.

First of all, Milan is one of the earliest towns to have a public tower clock 
in the 14th century, but it would only strike and show hours according to local 
solar time.  It would not be divided into minutes.  It was not reliable enough 
for such a horological chart.

Sundials would be the more commonly used timepiece, but the six-minutes is an 
unusual amount of precision.  My guess is that the court astronomer was using 
an astrolabe, which can be divided into units in the range of 4-6 minutes.  
Many also had arcs for the astrological houses and for both equal and unequal 
hours.  The actual time might have been taken from a bright star still visible 
in the dawn.

It is also worth considering what this 6-minutes after dawn really means.  Is 
the astrologer using unequal hours which were still more common in these early 
days of clocks?  If so, then six minutes would be equal to 1/10 of the first 
hour on that day of the year-i.e., 1/10 of 1/12 of the length of daylight.

Lastly, in reconstructing a horoscope, one needs to know the position of the 
planets to place them on the chart.  Some might be observed, but mostly they 
are taken from a table.  These varied in different manuscript traditions.  Do 
we have a clue what table the astrologer was using?

Good luck with your project.

Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



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sundials marked 1671

[Schechner, Sara]

Hi Friends,

I have come across two sundials having the same strange motto and  both marked 
1671.  One is described in The Teesdale Mercury, Sept. 8, 1920 under local 
news.  I transcribe it here:

Mr. Ingram Dawson, of Oak Bank, is the owner of a quaint old sun dial, dated 
1671, and bearing the following inscription, reminding the passers-by of the 
flight of time and the uncertainty of life, a favourite subject of dial-makers 
:--
Arise, my friends : no time to dream.
Thou art passing hence.  Ere the sunray's beam.
As the day runs.  So your death comes-
Ye time and hour, ye knoweth not.

Note:  The paper probably meant the locale Oaks Bank, which is near Teesdale, 
County Durham, England.

The second example is in private hands.  It has the same poem but varies in 
spelling and punctuation.  It may be a copy of the first one.  I suspect it is 
not from 1671.  I dare say that the first may also be circa 1900 and not 1671, 
but I have not seen it.

Does anyone know the current location of the Oaks Bank dial (if it survives)?
Has anyone seen any other sundials similar to these two?
Does anyone know a source for this inscription (aside from the reference to 
Matthew 25:13--Watch therefore, for ye know neither the day nor the hour)?

I look forward to any leads you can give me.

Stay safe in these days of the coronavirus!
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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sundial request for Marblehead, Massachusetts

[Schechner, Sara]

Dear Fellow Dialists,

Ellaine Rose of Marblehead, Massachusetts would like to have a vertical sundial 
made for her home.  It would be placed on a southwesterly wall facing the 
harbor, where it could be seen from boats.  She envisions a motto, "Time and 
Tide Wait for No One."  She needs help with the layout of hour lines and 
fabrication, but might wish to assist in painting a background scene.

If you are interested in this commission, please contact Ellaine Rose directly 
at ellai...@comcast.net.  I think it will be a 
delightful project to work on.

Best wishes,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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RE: Gnomon Gap Puzzle

[Schechner, Sara]

Hi Frank,

At the Adler Planetarium, there is a portable universal equatorial brass 
sundial (T-19) with a propped equatorial plate whose edges cast a shadow on a 
horizontal surface below.  It works in a similar manner to the Nuremberg 
diptych Maciej pointed out.  

The same technique is used with some overhangs on polyhedral dials in the 
Adler, but these examples are for fixed latitudes. For instance, M-324, A-400, 
and M-322.

Here is a link to some images.  
https://www.dropbox.com/sh/nb4abv7eb2uspb3/AACnDhwBf-L5QVcvaZrh3Deoa?dl=0 

These sundials will all be pictured and described in the forthcoming volume of 
the Adler's sundial catalogue, which I have authored.  The volume is in press!

Cheers,
Sara



-Original Message-
From: Frank King  
Sent: Wednesday, January 02, 2019 3:42 AM
To: Schechner, Sara ; ml...@interia.pl
Cc: Frank King ; sundial@uni-koeln.de
Subject: Re: Gnomon Gap Puzzle

Dear Maciej and Sara,

Gosh.  Those are really incredible dials.
The Nested L-shapes of the chapter rings on the Jacques Le Marie dial are very 
cleverly set out.  I wonder how big a market there was for this kind of dial!

Maciej's description of a Nuremberg
Diptych - The shadow was cast by the
edges of the upper leaf of the dial -
is quite close to what I have in mind.

This would be fine in British Latitudes
but as you move nearer to the equator
you find yourself having to peer inside
an ever-narrowing gap!

Very best wishes

Frank

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RE: Gnomon Gap Puzzle

[Schechner, Sara]

Dear Frank,
I love the solution that Maciej pointed out in the Troschel dial (MHS 70006) 
and want to add that I have seen on this also on polyhedral dials.  

In addition, Harvard has a double-string-gnomon inclining dial by Jacques Le 
Maire (CHSI 7416) 
(http://waywiser.fas.harvard.edu/objects/12220/inclining-doublestringgnomon-sundial?ctx=c7b5cc99-4010-4ef5-a0ef-a842c4c635e4=53)
 which is like the Troschel but portable for multiple latitudes.

Happy New Year,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344 
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


-Original Message-
From: sundial  On Behalf Of Frank King
Sent: Tuesday, January 01, 2019 10:42 AM
To: ml...@interia.pl; john.f...@keme.co.uk; steve.lelievre.can...@gmail.com
Cc: sundial@uni-koeln.de
Subject: Re: Gnomon Gap Puzzle

Dear Maciej, John and Steve

Congratulations on coming up with several ideas.  I should have asked your 
advice several months ago!

Although your ideas seem wildly different, they all share elements of the 
actual design which I shall reveal in due course.

Maciej: I am most grateful to you for drawing my attention to the Hans Troschel 
diptych dial.
I didn't know of this before and its design is certainly (almost) confined by 
the noon gap.
This is getting very close to my thoughts.

John: you ask...

> Could you be designing a vertical dial for an interior south facing 
> wall with a 'Velux'
> type window (or any rectangular glassed-in
> section) in the sloping ceiling above?

This is less like my design but, although on a different scale, it has features 
in common with the Hans Troschel dial so it, too, is on the right lines.

> Alternatively could one use an unsupported sloping porch roof as an 
> underslung gnomon...

That would certainly work but I suspect there would be a temptation to include 
markings outside the gnomon gap.

> But it would not be very weatherproof with no sides to the roof!

Well, let's call it a sloping sun-shade such as was once common on shop fronts 
in summer.
You could decorate the shop front with the dial markings.  In British latitudes 
the shade would be very steeply sloping.  The idea would be fine in 
sub-tropical latitudes which have more need of shade!

Steve: I must study your arrangement in more detail but, at first reading, you 
have a good scheme which again shares elements of the design I came up with!  
You will certainly be surprised when you see the space that I had to deal with 
:-)

I might just add that my design can be
implemented for a total outlay of no more than one US dime!  Not all sundials 
are mega-expensive!!

More in due course!

Frank

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RE: Bird shapes in gnomons

[Schechner, Sara]

Hi Gino,
Your Bird of Time dial is gorgeous.  Thanks for sharing it.
Sara

From: GINO SCHIAVONE 
Sent: Friday, November 02, 2018 2:48 PM
To: Schechner, Sara ; Steve Lelievre 
; john.davi...@btopenworld.com
Cc: Sundial List 
Subject: Re: Bird shapes in gnomons

Greetings all,
  I have enjoyed the exchanges and information. I go with whimsy. The first 
time I saw an image of a Butterfield dial I was struck with both a sense of 
whimsy and the desire to make sundials. I would like to share pictures of my 
Butterfield-ish dial with a griffin index and my "Bird of Time" dial.
  Thank you for your contributions.


Gino Schiavone
Taos, NM



Gino Schiavone
The Schiavone Studio
1337 Gusdorf Road, Ste J
Taos, NM 87571

575-758-7797
575-613-0943


From: sundial 
mailto:sundial-boun...@uni-koeln.de>> on behalf 
of Schechner, Sara mailto:sche...@fas.harvard.edu>>
Sent: Thursday, November 1, 2018 8:49 AM
To: Steve Lelievre; 
john.davi...@btopenworld.com<mailto:john.davi...@btopenworld.com>
Cc: Sundial List
Subject: RE: Bird shapes in gnomons


Hi Steve (and John),



Dolphin supporters and decorations on sundials and scientific instruments is 
very common in the France, 16th-18th century.  It was a cultural symbol 
reinforced by the crown prince being the Dauphin.   I believe fish and dolphin 
supporters on English dials is much more modern.



I don't know what you mean about wedges below the gnomon on the Virginia 
Metalcrafters' cast metal dials.  Most of the mass produced garden dials I have 
seen were "one size fits all"-This meant that they rarely worked because hour 
lines and gnomon angles were not correct for the latitudes in which they were 
set up.  I would not speculate that there was any mix or match; real evidence 
is needed.   My impression of these firms is that they were marketing what was 
alleged to be a Victorian style-complete with the winged sandglass and Robert 
Browning quotation.  All rather hokey.



The use of a phoenix might be less to do with the Sun than the idea of renewal 
and rebirth, day following night, and the cycles of time.



Cheers,

Sara



From: Steve Lelievre 
mailto:steve.lelievre.can...@gmail.com>>
Sent: Wednesday, October 31, 2018 11:54 PM
To: Schechner, Sara mailto:sche...@fas.harvard.edu>>; 
john.davi...@btopenworld.com<mailto:john.davi...@btopenworld.com>
Cc: Sundial List mailto:sundial@uni-koeln.de>>
Subject: Re: Bird shapes in gnomons



Hi Sara and John,



Thanks for your replies. It's interesting to be able to trace the bird motif to 
Butterfield's time. It just leaves me wondering why he chose to use a bird. 
Absent any other explanation, I'll assume it was whimsy.



Sara, because the URL you mentioned is a link to your CHSI website, clicking 
through reminded me of my visit during the NASS conference a few years back. I 
don't specifically remember the Butterfield dials in your collection, but I 
think that's maybe because I was so mesmerized by all the amazing, exquisite 
ivory diptychs that everything else pales in my memory. The photos of the 
Butterfields look pretty good too, though.



John, your comment that English dials tending to use fish or dolphins as 
supporters got me wondering if the use of birds is more of a North American 
thing, so I did a bit of Googling about that.



There's a bit of a story



It seems that mass production of cast iron and later cast bronze horizontal 
sundials in North America started in the late 19th or early 20th C. Over the 
subsequent century, there seem to have been at least two companies that did 
well and that had gnomon designs featuring birds. I think this probably 
explains, in part, why I have encountered so many dials with this attribute.



One company, the W.J. Loth Stove company of Waynesboro, Virginia, was set up in 
1890. They started out making stoves and cast kitchenware, and apparently were 
the original owners of the Hotpoint brand of home appliances. By the late 1930s 
they were using the brand name Virginia Metalcrafters, which later became the 
company name, for an assortment of decorative home goods including sundials. 
They ceased trading in 2006. The other company  is Rome Industries of Peoria, 
Illinois, founded in 1964 and still operating. Their range of sundials are 
generally remarkably similar to the Virginia Metalcrafters line. In fact, one 
could be forgiven for thinking that some models are copies of the other 
company's products. Compare Virginia Metalcrafters'  
https://tinyurl.com/yd6qsqk4<https://urldefense.proofpoint.com/v2/url?u=https-3A__tinyurl.com_yd6qsqk4=DwMDaQ=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=uAca4uFHQN1XV5F2dJjmoHKymGItBuk589Fn82zCrIo=vcv7sNZotUdmsusnpUylTHamXxzcLC99RbH2DAWODb8=>
 and Rome's  
https://tinyurl.com/y75dorrk<https://urldefense.proofpoint.com/v2/url?u=https-3A__tinyurl.com_y75dorrk=Dw

RE: Bird shapes in gnomons

[Schechner, Sara]

Good points.

From: Steve Lelievre 
Sent: Thursday, November 01, 2018 1:26 PM
To: Schechner, Sara ; john.davi...@btopenworld.com
Cc: Sundial List 
Subject: Re: Bird shapes in gnomons

On 2018-11-01 7:49 a.m., Schechner, Sara wrote:
I would not speculate that there was any mix or match; real evidence is needed.

Yes, I agree that evidence is needed.

I have seen the same gnomon casting used for different dial faces, and the same 
dial face with different gnomons. I supposed  it could be from allowing 
customers to mix-and-match (or even the manufacturer treating parts as 
swappable), but on reflection I realize it is equally as likely to happening in 
the second-hand market as vendors discard broken or corroded parts and 
reassemble 'complete' dials from what's left.

Steve
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RE: Bird shapes in gnomons

[Schechner, Sara]

Hi Steve (and John),

Dolphin supporters and decorations on sundials and scientific instruments is 
very common in the France, 16th—18th century.  It was a cultural symbol 
reinforced by the crown prince being the Dauphin.   I believe fish and dolphin 
supporters on English dials is much more modern.

I don’t know what you mean about wedges below the gnomon on the Virginia 
Metalcrafters’ cast metal dials.  Most of the mass produced garden dials I have 
seen were “one size fits all”—This meant that they rarely worked because hour 
lines and gnomon angles were not correct for the latitudes in which they were 
set up.  I would not speculate that there was any mix or match; real evidence 
is needed.   My impression of these firms is that they were marketing what was 
alleged to be a Victorian style–complete with the winged sandglass and Robert 
Browning quotation.  All rather hokey.

The use of a phoenix might be less to do with the Sun than the idea of renewal 
and rebirth, day following night, and the cycles of time.

Cheers,
Sara

From: Steve Lelievre 
Sent: Wednesday, October 31, 2018 11:54 PM
To: Schechner, Sara ; john.davi...@btopenworld.com
Cc: Sundial List 
Subject: Re: Bird shapes in gnomons

Hi Sara and John,

Thanks for your replies. It's interesting to be able to trace the bird motif to 
Butterfield's time. It just leaves me wondering why he chose to use a bird. 
Absent any other explanation, I'll assume it was whimsy.

Sara, because the URL you mentioned is a link to your CHSI website, clicking 
through reminded me of my visit during the NASS conference a few years back. I 
don't specifically remember the Butterfield dials in your collection, but I 
think that's maybe because I was so mesmerized by all the amazing, exquisite 
ivory diptychs that everything else pales in my memory. The photos of the 
Butterfields look pretty good too, though.

John, your comment that English dials tending to use fish or dolphins as 
supporters got me wondering if the use of birds is more of a North American 
thing, so I did a bit of Googling about that.

There's a bit of a story

It seems that mass production of cast iron and later cast bronze horizontal 
sundials in North America started in the late 19th or early 20th C. Over the 
subsequent century, there seem to have been at least two companies that did 
well and that had gnomon designs featuring birds. I think this probably 
explains, in part, why I have encountered so many dials with this attribute.

One company, the W.J. Loth Stove company of Waynesboro, Virginia, was set up in 
1890. They started out making stoves and cast kitchenware, and apparently were 
the original owners of the Hotpoint brand of home appliances. By the late 1930s 
they were using the brand name Virginia Metalcrafters, which later became the 
company name, for an assortment of decorative home goods including sundials. 
They ceased trading in 2006. The other company  is Rome Industries of Peoria, 
Illinois, founded in 1964 and still operating. Their range of sundials are 
generally remarkably similar to the Virginia Metalcrafters line. In fact, one 
could be forgiven for thinking that some models are copies of the other 
company's products. Compare Virginia Metalcrafters'  
https://tinyurl.com/yd6qsqk4<https://urldefense.proofpoint.com/v2/url?u=https-3A__tinyurl.com_yd6qsqk4=DwMDaQ=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=uAca4uFHQN1XV5F2dJjmoHKymGItBuk589Fn82zCrIo=vcv7sNZotUdmsusnpUylTHamXxzcLC99RbH2DAWODb8=>
 and Rome's  
https://tinyurl.com/y75dorrk<https://urldefense.proofpoint.com/v2/url?u=https-3A__tinyurl.com_y75dorrk=DwMDaQ=WO-RGvefibhHBZq3fL85hQ=7ZsgDX5inZSMERqhZEQacOtdADP0iy6-YB7dx6Z_mVo=uAca4uFHQN1XV5F2dJjmoHKymGItBuk589Fn82zCrIo=EyBS9RoKSvRFW12WA8_SGs9C0xtcYqMGq273k_vhwPk=>
 . If they aren't copies, could it be that both are modeled after the same 
earlier design - I wonder.

Both companies seem to have had a small choice of dial faces, mottos (basically 
the same wordings available from both companies), and gnomons (including the 
bird device) so my guess is that customers could mix and match. Both have 
winged hourglasses as dial furniture (referring to "time flies"). At least 
Virginia Metalcrafters had wedges at the bottom of the gnomon, which I guess 
allowed for milling to the appropriate angle - in which case I imagine that 
each of the the stock dial faces would have needed a few latitude variants too. 
By around 1950 Virginia Metalcrafters had some kind of arrangement with the US 
National Parks Service to make reproduction dials for US National Historic 
Sites. After closing down, their factory was designated as a Historic District.

Long story short, because of these two companies, there are quite a lot of 
sundials dotted around North America, including some at much-visited National 
Historic Sites, with bird gnomons. There are even several on eBay at the 
present time.

None of this explains why they chose b

RE: Bird shapes in gnomons

[Schechner, Sara]

Hi Steve,
You may know about the fabulously popular, fashionable Paris accessory from 
circa 1675 to the end of the 18th century:  The Butterfield-type dial.  The 
pocket dial had a gnomon with an adjustable angle for use at different 
latitudes.  A sweet little bird's beak was the index on the latitude scale.  
See here for examples: http://waywiser.rc.fas.harvard.edu/search/butterfield  

Invented by Michael Butterfield, they were made by many different makers in 
Paris.  They were so desirable that counterfeits were made signed Butterfield.

Sara

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344  |   sche...@fas.harvard.edu  
|@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/




-Original Message-
From: sundial  On Behalf Of Steve Lelievre
Sent: Tuesday, October 30, 2018 2:24 PM
To: Sundial List 
Subject: Bird shapes in gnomons

Hello,

Gnomons on horizontal dials are mostly either undecorated triangles, or have 
simple polygonal or sigmoidal fretwork. However, recently I realized that the 
next most common form I encounter is a gnomon carved with the shape or 
silhouette of a bird. For example:

http://sundials.org/images/NASS_Registry/Dial_334/334_md_towson_hampton_2a.jpg

http://sundials.org/images/NASS_Registry/Dial_325/325_md_baltimore_clyburn_1.jpg
(using a small stick to replace the missing filament that formed the style)

http://sundials.org/images/NASS_Registry/Dial_920/920_bc_vancouver_knox_church-2a.jpg

Is it coincidence that I encounter these designs relatively often? Or, is there 
some tradition of using bird motifs on sundials? If so, how did it originate 
and what do they symbolize?

Steve




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Re: Dyptich sundial - help!

[Schechner, Sara]

I am camping at Stellafane with little connection, so will keep this brief 
until I return to civilization!

The gnomon is adjustable for different latitudes.  The choice determines the 
correct horizontal scale to use around the compass.  The 2 pin gnomon scaphe 
sundial are for finding Italian and Babylonian (or Nuremberg hours).  The 
instrument with the spinning pointer is a wind vane.
The instrument is made in Nuremberg in the early 17th century.

Sara

Sent from my iPhone

On Aug 10, 2018, at 12:48 PM, Michael Ossipoff 
mailto:email9648...@gmail.com>> wrote:

Yes, the Boy Scouts of America at least used to sell a Compass-Oriented Dyptich 
dial with several concentric rings, each having different hour-lines, and with 
its string-gnomon adjustable for latitude, with several attachment-points on 
the vertical surface. I think it accommodated 3 latitudes. The hour-line rings 
were rectangular, it seems to me.

Someone at this forum designed a universal Horizontal-Dial whose hour lines 
were curved lines originating from the gnomon-string's base-attrachment, with 
latitude-labeled concentric circles telling where to read the hour lines for 
the various latitudes.  ...and of course with the string-gnomon slidable in a 
vertical slot in the vertical surface.

Michael Ossipoff



On Fri, Aug 10, 2018 at 4:22 AM, Dan-George Uza 
mailto:cerculdest...@gmail.com>> wrote:
Dear all,

I've recently found this piece in a museum near me and I need your help in 
dating it.

Why are the hour marks offset? I suspect a correction for latitude. And what do 
the two small circular dials on the bottom measure?

Also what would be the purpose of the circular shape containing the alidade? I 
suspect it has something to do with the winds.

Any info will be highly appreciated.

Thank you,

Dan Uza




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Re: Dyptich sundial - help!

[Schechner, Sara]

The diptych was made by Thomas Ducher.

Sent from my iPhone

On Aug 10, 2018, at 12:48 PM, Michael Ossipoff 
mailto:email9648...@gmail.com>> wrote:

Yes, the Boy Scouts of America at least used to sell a Compass-Oriented Dyptich 
dial with several concentric rings, each having different hour-lines, and with 
its string-gnomon adjustable for latitude, with several attachment-points on 
the vertical surface. I think it accommodated 3 latitudes. The hour-line rings 
were rectangular, it seems to me.

Someone at this forum designed a universal Horizontal-Dial whose hour lines 
were curved lines originating from the gnomon-string's base-attrachment, with 
latitude-labeled concentric circles telling where to read the hour lines for 
the various latitudes.  ...and of course with the string-gnomon slidable in a 
vertical slot in the vertical surface.

Michael Ossipoff



On Fri, Aug 10, 2018 at 4:22 AM, Dan-George Uza 
mailto:cerculdest...@gmail.com>> wrote:
Dear all,

I've recently found this piece in a museum near me and I need your help in 
dating it.

Why are the hour marks offset? I suspect a correction for latitude. And what do 
the two small circular dials on the bottom measure?

Also what would be the purpose of the circular shape containing the alidade? I 
suspect it has something to do with the winds.

Any info will be highly appreciated.

Thank you,

Dan Uza




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loss of Peter Abrahams

[Schechner, Sara]

Dear Friends,
Many of you may have known Peter Abrahams of Portland, Oregon.  Peter was one 
of the first members of NASS, which was where I met him some 25 years ago.  He 
was also active in other scientific instrument societies, such as the Antique 
Telescope Society, the Scientific Instrument Commission, etc.

I am deeply saddened to say that Peter passed away suddenly last week of a 
massive heart attack.  He will be greatly missed.

Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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Maignan's ceiling sundial in the Palazzo Spada

[Schechner, Sara]

Dear All,

A colleague is looking for source material on Emmanuel Maignan's catoptric 
sundial on a ceiling in the Palazzo Spada in Rome.  Maignan published his own 
account of the design in Perspectiva horaria sive De horographia gnomonica tum 
theoretica, tum practica libri quatuor (Rome, 1648).  Have there been any 
articles on the ceiling sundial in the various journals on sundials or 
astronomy?

Thanks for your help.  Happy Holidays!
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344   |   
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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Fwd: [HASTRO-L] Archaeologists Find Rare Ancient Roman Sundial Still Inscribed With Owner's Name

[Schechner, Sara]

Archaeologists Find Rare Ancient Roman Sundial Still Inscribed With Owner's 
Name (This is apparently recent news.)

"Archaeologists digging at a theater have uncovered an ancient Roman sundial 
that a man had built to celebrate winning an election to public office. The 
2,000-year-old sundial, a rare find because it is intact, according to the 
University of Cambridge, contains an inscription in ancient Roman lettering
on its base

http://www.ibtimes.com/archaeologists-find-rare-ancient-roman-sundial-still-
inscribed-owners-name-2612135


https://tinyurl.com/y84rkd8n
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RE: publication on Science of Time, with sundials

[Schechner, Sara]

Dear All,
The links were free to me and others, but perhaps we are somehow inside the 
firewall.  I don't understand what is going on, since I have not logged into 
the Springer site.  

Here is a link to my download of the book: 
https://www.dropbox.com/s/uly1qfaov3intr1/Science%20of%20Time%202016%20BOOK_978-3-319-59909-0.pdf?dl=0
   

I hope this will help.
Sara


-Original Message-
From: Richard Langley [mailto:l...@unb.ca] 
Sent: Thursday, November 02, 2017 3:27 PM
To: Schechner, Sara
Cc: sundial@uni-koeln.de
Subject: Re: publication on Science of Time, with sundials

For free? Not when I followed the links.
-- (Prof.) Richard Langley

-
| Richard B. LangleyE-mail: l...@unb.ca |
| Geodetic Research Laboratory  Web: http://gge.unb.ca/ |
| Dept. of Geodesy and Geomatics EngineeringPhone:+1 506 453-5142   |
| University of New Brunswick   Fax:  +1 506 453-4943   |
| Fredericton, N.B., Canada  E3B 5A3|
|Fredericton?  Where's that?  See: http://www.fredericton.ca/   |
-



> On Nov 2, 2017, at 3:43 PM, Schechner, Sara <sche...@fas.harvard.edu> wrote:
> 
> Dear Friends,
>  
> In June 2016, I attended a symposium on the Science of Time.  The 
> proceedings have now been published by Springer, and are available for 
> free download here:  
> https://link.springer.com/book/10.1007/978-3-319-59909-0
>  
> The Science of Time 2016: Time in Astronomy & Society, Past, Present 
> and Future Edited by  Elisa Felicitas Arias, Ludwig Combrinck, Pavel Gabor, 
> Catherine Hohenkerk, and P. Kenneth Seidelmann.
> Astrophysics and Space Science Proceedings, vol 50.
> Cham: Springer International Publishing AG, 2017
>  
> Many articles may be of interest to this group, but in particular there are 
> two articles on sundials.  I list them below along with direct links ot the 
> PDFs:
>  
> Geoff Parsons:  “The Development and Use of the Pilkington and Gibbs 
> Heliochronometer and Sol Horometer”
> https://link.springer.com/content/pdf/10.1007%2F978-3-319-59909-0_7.pd
> f
>  
> Sara J. Schechner:  “These Are Not Your Mother’s Sundials: Or, Time and 
> Astronomy’s Authority”
> https://link.springer.com/content/pdf/10.1007%2F978-3-319-59909-0_8.pd
> f
>  
> Happy reading!
> Sara
>  
> Sara J. Schechner, Ph.D.
> David P. Wheatland Curator of the Collection of Historical Scientific 
> Instruments Lecturer on the History of Science Department of the 
> History of Science, Harvard University Science Center 251c, 1 Oxford 
> Street, Cambridge, MA 02138
> Tel: 617-496-9542   |   Fax: 617-495-3344  |   sche...@fas.harvard.edu  
> |@SaraSchechner
> http://scholar.harvard.edu/saraschechner
> http://chsi.harvard.edu/
>  
>  
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial

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publication on Science of Time, with sundials

[Schechner, Sara]

Dear Friends,

In June 2016, I attended a symposium on the Science of Time.  The proceedings 
have now been published by Springer, and are available for free download here:  
https://link.springer.com/book/10.1007/978-3-319-59909-0

The Science of Time 2016: Time in Astronomy & Society, Past, Present and Future
Edited by  Elisa Felicitas Arias, Ludwig Combrinck, Pavel Gabor, Catherine 
Hohenkerk, and P. Kenneth Seidelmann.
Astrophysics and Space Science Proceedings, vol 50.
Cham: Springer International Publishing AG, 2017

Many articles may be of interest to this group, but in particular there are two 
articles on sundials.  I list them below along with direct links ot the PDFs:

Geoff Parsons:  "The Development and Use of the Pilkington and Gibbs 
Heliochronometer and Sol Horometer"
https://link.springer.com/content/pdf/10.1007%2F978-3-319-59909-0_7.pdf

Sara J. Schechner:  "These Are Not Your Mother's Sundials: Or, Time and 
Astronomy's Authority"
https://link.springer.com/content/pdf/10.1007%2F978-3-319-59909-0_8.pdf

Happy reading!
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344  |   
sche...@fas.harvard.edu  |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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RE: wonderful exhibit of sundials in New York City - only until 23 April

[Schechner, Sara]

I recently saw the show too, and it contains many of the most famous dials from 
antiquity.  It is a show of "greatest hits."  To me, that was the most amazing 
part.  Well worth seeing before it closes in April.  For those who cannot make 
it, there is a good website.  You can start here to whet your appetite,  
http://isaw.nyu.edu/  or more directly here, 
http://isaw.nyu.edu/exhibitions/time-cosmos.

Cheers,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Woody Sullivan
Sent: Saturday, March 25, 2017 9:11 AM
To: sundial@uni-koeln.de
Subject: wonderful exhibit of sundials in New York City - only until 23 April

Our list was informed of the exhibit "Time and Cosmos in Greco-Roman Antiquity" 
last October, but I remind you now because I was just able to view it, and was 
flabbergasted at how marvellous it is. First-rate sundials and related items 
(such as floor mosaics depicting dials) from the ancient world brought together 
from museums around the world. And beautifully displayed and explained. The 
accompanying book (~$60) is also first-rate.

New York Times article:  A Manhattan Exhibit With Antiquity on the 
Clock


- Woody


***
Prof. (Emeritus) Woodruff T. Sullivan, III  
  tel  206-543-7773
Dept. of Astronomy & Astrobiology ProgramBox 351580
University of Washington
Seattle, WA 98195  USA
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RE: Genuine or not?

[Schechner, Sara]

This sundial seems too fanciful to me, with the ship, the Latin motto, and the 
green foliage (that looks like a dancing cactus to me!) to be an actual copy of 
an earlier one.   It is 20th century, but I don’t know from the photos if it is 
circa 1920.   It could be some sort of souvenir from a museum shop.

By the way, plumb-bobs with little storage holes are found on some ivory 
diptych sundials of the 16th century and later.

Cheers,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-495-3344
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Dan-George Uza
Sent: Monday, February 20, 2017 9:58 AM
To: sundial@uni-koeln.de
Subject: Genuine or not?

Hello!

There's a diptych sundial on sale for about 80 euros supposedly dating from 
1920.

Do you think this is genuine? I think it is a modern replica.

http://anticariatulnou.ro/diverse/antichitati-artizanat-colectionabile/cadran-solar-cu-busola-antica-din-lemn-diptic.html

The string does not seem to be adjustable for latitude, I see only one hole 
(it's fixed at 42 deg.). Why then go through the trouble of printing the 
latitudes for European cities on the back?

One thing I find interesting is the plumb bob and the orifice on the vertical 
plate. I think it is meant to align the piece to the vertical. I haven't seen 
this before.

Thanks,

Dan Uza
Romania
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RE: Astronomy Picture of the Day (Again)

[Schechner, Sara]

I love it!  I just forwarded it on to some folks.  Happy Solstice Everyone!!!
Sara

On Wed, Dec 21, 2016 at 8:43 AM, Robert Terwilliger 
> wrote:
This is a good one!

Traces of the Sun
http://apod.nasa.gov/apod/ap161221.html

Bob


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Re: Terms to describe markings on dials (or other objects)

[Schechner, Sara]

Possibilities from art historical use are:
Positive, above background surface--In raised letters, or lettering in relief
Negative, below background surface--In sunken letters, or lettering in 
counter-relief

Sara Schechner 

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new work on European pocket dials in Colonial America

[Schechner, Sara]

Dear All,

I am excited to report the recent publication of my essay-really a monograph 
inside a book-concerning sundials used in colonial North and South America:

EUROPEAN POCKET SUNDIALS FOR COLONIAL USE IN AMERICAN TERRITORIES
by Sara J. Schechner, in How Scientific Instruments Have Changed Hands 
(http://www.brill.com/products/book/how-scientific-instruments-have-changed-hands),
 edited by Alison Morrison-Low, Sara J. Schechner, and Paolo Brenni, Scientific 
Instruments and Collections 5 (Leiden: Brill, 2016).   The essay is 55 pages 
and well-illustrated by photographs and maps.

The work discusses the kinds of portable sundials brought to the Americas by 
European explorers and settlers, and how these were adapted for use there.  It 
describes who needed or desired the sundials, where they were produced, and 
what their geographical range was.   The monograph analyzes archaeological 
evidence, household and business inventories, and most importantly, the very 
rare extant pocket sundials strongly linked to remote forts, tribal lands, 
battlefields, slave plantations, and colonial administrative seats.  These 
sundials shed light on the relationship of Time to imperialism and the 
transmission of cartographic and ethnographic knowledge during the colonial 
period.

I hope that you will enjoy reading it!

Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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RE: Longcase Clock with Equation of TIme

[Schechner, Sara]

All good clocks were set by sundial or observation of the sun’s transit or 
stars until the mid-19th century and the use of time signals sent along 
telegraph lines.  Some people then set their personal clocks or watches to 
these observatory or town clocks (often set up by jewelers or clock shops—you 
still see these “street clocks”), but many preferred to use their own sundials 
or dipleidoscopes  to set their clocks or watches.  Pocket watches had “watch 
papers” in the case that  gave the equation of time and advertised the 
watchmaker who last cleaned the watch.

Cheers,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/




From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of 
rodwall1...@gmail.com
Sent: Friday, October 07, 2016 6:07 AM
To: 'Sundial list'
Subject: Re: Longcase Clock with Equation of TIme

Hi all,

In 1730. I think I heard somewhere that. Clock manufacturers also sometimes 
gave a small window sundial to allow you to set your clock. With a equation of 
time table. Is that correct?

Roderick Wall..
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RE: Longcase Clock with Equation of TIme

[Schechner, Sara]

Let us not forget the famous long-case clock by Thomas Tompion in 1709 for the 
Pump Room in Bath, England.  It is an “equation clock” showing the difference 
between solar and mean time.   Here is a link to an image of the dial:
https://www.duetimeblog.com/wp-content/uploads/2009/09/img_2007.jpg

Tompion also placed a sundial outside of the Pump Room.   See 
http://bathsbloggers.blogspot.com/2016/03/the-tompion-clock.html for a photo 
along with the clock.

Cheers,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



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Sixteenth-century wall dials with planetary hours?

[Schechner, Sara]

Dear All,
Attached below is an inquiry from a colleague, Richard Kremer.  Please copy him 
on your replies.  Photos of the wall sundial in question can be found here: 
https://www.dropbox.com/sh/vdvlsur0w626kfe/AACEf1HseuQZm2SYtesQYHmra?dl=0

Best wishes,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/


>From Rich Kremer:

Sixteenth-century wall dials with planetary hours?

Around 1550, Zacharias Scultetus designed two wall dials for the facade of a 
handsome Renaissance-style house in Görlitz, Germany (see: 
https://www.dropbox.com/sh/vdvlsur0w626kfe/AACEf1HseuQZm2SYtesQYHmra?dl=0).
  The Solarium on the left includes lines for civil hours, Italian hours, 
Nuremberg hours. The Arachne on the right includes lines for the planetary 
hours (showing the ruling planets for each hour) and the solar altitudes, 
azimuths and astrological houses.

Are other sixteenth-century wall dials known that show planetary hours in this 
manner?

Please direct your correspondence to 
richard.kre...@dartmouth.edu.  Many thanks.


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RE: [HASTRO-L] Mosaic with sundial on a pillar

[Schechner, Sara]

These are all really wonderful, Rob.  Thanks so much for drawing our attention 
to them.  And thanks to you, Lorenzo, for your remarks.

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932 
sche...@fas.harvard.edu |@SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



-Original Message-
From: History of Astronomy Discussion Group [mailto:hastr...@listserv.wvu.edu] 
On Behalf Of Gent, R.H. van (Rob)
Sent: Monday, April 25, 2016 5:40 AM
To: hastr...@listserv.wvu.edu
Subject: Re: [HASTRO-L] Mosaic with sundial on a pillar

Hi Lorenzo,

Thanks for your insightful comments.

You can find better images of the Antioch (Antakya) mosaic here 

http://www.uskinfo.ba/m/vijest/foto-pronaden-mozaik-s-porukom-budi-veseo-zivi-zivot-iz-3-stoljeca-prije-nove-ere/22031

A better image of the other sundial mosaic found in Daphne (Harbiye), also near 
Antioch, can be found here

http://www.hatayarkeolojimuzesi.gov.tr/HatayMuzeWeb/faces/jsp/layouts/inventoryCollectionDetail.jsp?inventoryid=3762

For accessing the complete high-resolution image, save the website (complete) 
and look in the folder saved with the html file. 

The Hatay Archaeology Museum in Antakya has a website

http://www.hatayarkeolojimuzesi.gov.tr/HatayMuzeWeb/flash/main_EN.html

which gives digital access to numerous other interesting mosaics

http://www.hatayarkeolojimuzesi.gov.tr/HatayMuzeWeb/faces/jsp/layouts/search.jsp?Lang=en

The sundial mosaic is nr. 865.

Also of interest is nr. 949a-950 with a panel illustrating the story of Perseus 
and Andromeda.

More mosaics with a sundial on a pillar are here

http://michel.lalos.free.fr/cadrans_solaires/autres_pays/royaume_uni/cs_ile_de_wight.html

and here

http://www.electrummagazine.com/2011/11/platos-circle-in-the-mosaic-of-pompeii/

rvg


-Original Message-
From: History of Astronomy Discussion Group [mailto:hastr...@listserv.wvu.edu] 
On Behalf Of Lorenzo Smerillo
Sent: maandag 25 april 2016 10:44
To: hastr...@listserv.wvu.edu
Subject: Re: [HASTRO-L] Mosaic with sundial on a pillar

Rob,
The dot enclosing a circle is very important as the MSS evidence (v.
Neugebauer and van Hoesen) is always of a circle with a little 'pointed cap' 
attached.  I am not certain that the iconographic convention of mosaicists and 
astronomical writers need be the same, nor if there is other papyrical or 
inscriptional evidence for either, both of which are perfectly legible and 
understandable in se. The usual convention was to write out (Elios or Sol.  But 
a representation of a man looking at a sundial would representationally take 
more naturally a pictograph of Sol, and a circle enclosing a dot does that 
nicely.
I think that the 'little cap' is actually a borrowing from the usual 
iconographic representations ( as on the parapegmata from the Thermae Trainai, 
Dura Europus, the Rheinisches Landesmuseum mould, the Arlon hebdomadal, ) of 
SOL as a head with three or four radii, using only one, for, perhaps, scribal 
convenience.

The inscription on

http://www.gettyimages.nl/detail/foto/mosaic-depicting-man-looking-at-sundial-from-ancient-stockfotos/98953317

enatEparE / lasen   ~   e(i)natE parElasen
I would  translate as 'it has reached the ninth(hour)' .

Newspapers, and Turkish newspapers in particular, have some difficulty with AD 
and BC dates, as 1.) they are translating sloppily and 2.) they are essentially 
ephemeral in their scope. So the dates of the Graeco-Roman mosaics are not BC 
as you point out!

feliciter.
Lorenzo Smerillo
Department of Classics and Humanities
Montclair State University
Montclair, NJ 07043

On 23 April 2016 at 11:15, Gent, R.H. van (Rob)  wrote:

> Hi,
>
> The following news items on some recently discovered mosaics in Turkey 
> may be of interest to the list.
>
>
> http://www.hurriyetdailynews.com/be-cheerful-live-your-life-ancient-mo
> saic-meme-found-in-turkeys-south.aspx?PageID=238=98201=3
> 75
>
>
> http://www.dailysabah.com/nation/2016/04/22/2400-year-old-mosaic-found
> -in-southern-turkey-says-be-cheerful-enjoy-your-life
>
> Although the mosaics are probably later than claimed in these popular 
> press reports, the most interesting part of these mosaics (the middle
> one) depicts what appears to be a hemispherical sundial on a pillar.
>
> Note that the Sun is indicated above the sundial as a circled dot.
>
> For a similar mosaic with a sundial (also found in Turkey), see
>
>
> http://www.gettyimages.nl/detail/foto/mosaic-depicting-man-looking-at-
> sundial-from-ancient-stockfotos/98953317
>
> rvg
>
---

FW: Mosaic with sundial on a pillar

[Schechner, Sara]

>From the HASTRO-L discussion list, courtesy of Rob van Gent:

-Original Message-
From: History of Astronomy Discussion Group [mailto:hastr...@listserv.wvu.edu] 
On Behalf Of Gent, R.H. van (Rob)
Sent: Saturday, April 23, 2016 11:15 AM
To: hastr...@listserv.wvu.edu
Subject: [HASTRO-L] Mosaic with sundial on a pillar

Hi,

The following news items on some recently discovered mosaics in Turkey may be 
of interest to the list. 

http://www.hurriyetdailynews.com/be-cheerful-live-your-life-ancient-mosaic-meme-found-in-turkeys-south.aspx?PageID=238=98201=375

http://www.dailysabah.com/nation/2016/04/22/2400-year-old-mosaic-found-in-southern-turkey-says-be-cheerful-enjoy-your-life

Although the mosaics are probably later than claimed in these popular press 
reports, the most interesting part of these mosaics (the middle one) depicts 
what appears to be a hemispherical sundial on a pillar. 

Note that the Sun is indicated above the sundial as a circled dot.

For a similar mosaic with a sundial (also found in Turkey), see

http://www.gettyimages.nl/detail/foto/mosaic-depicting-man-looking-at-sundial-from-ancient-stockfotos/98953317

rvg
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CFP / more info on Science of Time conference

[Schechner, Sara]

CALL FOR PAPERS / Deadline to be extended beyond April 14, 2016.

The Harvard-Smithsonian Center for Astrophysics in Cambridge, MA (USA) 
announces a conference on Time and culture.

THE SCIENCE OF TIME: TIME IN ASTRONOMY AND SOCIETY, PAST, PRESENT, AND FUTURE
Cambridge, Massachusetts, USA
5-9 June 2016
10 June 2016 optional tour of the Harvard Collection of Historical Scientific 
Instruments, including a demonstration of astronomical regulator clocks.

The uses of time in astronomy - from pointing telescopes, coordinating and 
processing observations, predicting ephemerides, determining Earth orientation, 
analyzing time-series data and in many other ways - represent a broad sample of 
how time is used throughout human society and in space. Time and its 
reciprocal, frequency, is the most accurately measurable quantity and often an 
important path to the frontiers of science. But the future of timekeeping is 
changing with the development of optical frequency standards and the resulting 
challenges of distributing time at ever higher precision, with the possibility 
of timescales based on pulsars, and with the inclusion of higher-order 
relativistic effects. The definition of the second will likely be changed 
before the end of this decade, and its realization will increase in accuracy; 
the definition of the day is no longer obvious. The variability of the Earth's 
rotation presents challenges of understanding and prediction. It is time to 
take a closer look at time in astronomy and other sciences as a defining 
element of modern civilization.
The symposium aims to set the stage for future timekeeping standards, 
infrastructure, and engineering best practices for astronomers and the broader 
society.  It will explore the history of sundials, clocks, and calendars, and 
the social, cultural, and religious uses of timing information.
The theoreticians and engineers of time will be brought together with the 
educators and historians of science, enriching the understanding of time among 
both experts and the public.
Papers and posters are invited on topics such as these:

  *   The scientific and technical uses of time and time series data
  *   The civil and scientific understanding of time - education and outreach
  *   The history of time and timepieces, sundials, clocks, and calendars
  *   Social, cultural, and religious uses of timing information
  *   High-precision time from sundials and the pendulum to atomic clocks and 
pulsars
  *   Impact of precise time and frequency measurement in astronomy & basic 
science
  *   Earth rotation and time
  *   Time and solar-system ephemerides
  *   The physics of time
For submission of abstracts, registration, and other details, please visit 
http://sot2016.cfa.harvard.edu/.
Contact:  sot2...@cfa.harvard.edu

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

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Science of Time symposium, June 5-10, 2016

[Schechner, Sara]

Dear All,

The Harvard-Smithsonian Center for Astrophysics is organizing a symposium 
dedicated to Time and Culture.  Talks will be held in the Northwest Lab.  A 
tour will be held in the Harvard Collection of Historical Scientific 
Instruments' Putnam Gallery.  More information can be had here:  
http://sot2016.cfa.harvard.edu/



Best wishes,

Sara



Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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RE: Horary machine

[Schechner, Sara]

It looks to me like some kind of decllinatory for marking sundials.

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Dan-George Uza
Sent: Saturday, February 27, 2016 9:15 AM
To: sundial@uni-koeln.de
Subject: Horary machine

Hello!

An old print depicting a "horary machine" is being sold on E-bay. Can you 
please tell me what it is and how it works?

[Inline image 2]

http://www.ebay.com/itm/1766-PLUCHE-Horary-Machine-Ring-Dial-Sundial-Antique-Engraving-/291691633308?hash=item43ea2d1a9c:g:9nUAAOxyrrpTgZSe

Thanks!

Dan
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RE: Sundials in museums

[Schechner, Sara]

Another large collection, but in storage is that of the National Museum of 
American History, Smithsonian Institution, Washington, DC, USA.

As Karlheinz observed, there are fine but small collections in many locations, 
including archives, such as the David Eugene Smith Collection in the Columbia 
University Archives, New York.   Or the Mathematisch-Physikalischer Salon, 
Dresden.  Or the National Technical Museum, Prague.  
Indeed, many of the museums on this list provided by the 
NAWCC would have sundials.


Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edu  | @SaraSchechner
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/




From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of dharani
Sent: Friday, January 22, 2016 8:37 AM
To: sundial@uni-koeln.de
Subject: Re: Sundials in museums

Hello

I would like to thank everyone who replied to my recent inquiry about sundial 
collections in museums.
This is what I compliled based on all the suggestions:

- The Conservatoire des Arts et Metiers (CNAM), Paris, France
- Musée du Louvre, Paris, France
- Harvard University Collection of Historical Scientific Instruments, USA
- Adler Planetarium, Chicago, USA
- The Przypkowski Museum, Jędrzejów, Poland
- The Jagiellonian University Museum, Kraków, Poland
- Wroclaw University Museum, Wrocław, Poland
- Museum of the History of Science, Cambridge, UK
- Royal Museums Greenwich, London, UK
- Museum of the History of Science, Oxford, UK
- Poldi Pezzoli Museum, Minan, Italy
- Nordiska museet, Stockholm, Sweden
- Musée de la Vie Wallonne, Liege, Belgium

As I do similar research in my country I know there is about 20 other museums 
in Poland having sundials in their collections but the instrument quantity is 
rather insignificant.

Is there anything else one should consider while traveling?

I guess the best thing to do would be a worldwide sundial museums database with 
all the necessery data, practical info, collection description, and photos of 
the dials. What do you think about this?

--
Best regards
Darek Oczki
52N 21E
Warsaw, Poland
GNOMONIKA.pl
Sundials in Poland
http://gnomonika.pl

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RE: Gnomonica fundamentalis Johann Penther

[Schechner, Sara]

Hi,
The small bear is Ursa Minor as you suggest.  You can see the stars of the 
constellation on him.

Hinc nascitur ordo is a motto literally translated as “Hence the order [of 
things] is born.”   It sometimes appears as Rerum hinc nascitur ordo in 
devices.   It connotes power of a ruler or god, in the sense of “He gives birth 
to the order of things” or “the order arises from him.”

The forthcoming sundial catalog of the Adler Planetarium will have a couple of 
Penther-style sundials.

Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Lecturer on the History of Science
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Dan-George Uza
Sent: Monday, November 16, 2015 3:03 PM
To: sundial@uni-koeln.de
Subject: Gnomonica fundamentalis Johann Penther

Hello,

I am trying to make sense of this most interesting page from Johann Penther's 
book about sundials, Gnomonica fundamentalis, a work which I recently 
discovered in a local public library. It was published in German in 12 editions 
between 1733-1768, the edition I browsed being the last. At the top there is a 
bear with its tail pointing upwards which I think is most probably Ursa Minor, 
the Small Bear. This constellation's link to sundials is rather obvious due to 
Polaris. Below it is written HINC NASCITUR ORDO which I translate (perhaps 
wrongly) to THUS IT BEGINS ANEW. There is also the sun shining over Atlas which 
appears to be carrying a sundial globe on his shoulders. HORA RVIT means THE 
HOUR FLOWS.  The two animals (solar beasts, lions perhaps?) on each side of the 
picture are holding up vertical sundials, one meridional the other 
septentrional, while facing away from the sun's glare. Book title appears 
written inside a clamshell acting also as a vertical declining sundial.

The book cand be read here 
http://digi.ub.uni-heidelberg.de/diglit/penther1760

Penther also did a multiple sundial consisting of 12 pieces, see picture below.
https://upload.wikimedia.org/wikipedia/commons/9/97/SonnenuhrHAB2015.jpg


Dan-George Uza

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FW: CHSI's new publication

[Schechner, Sara]

I don't know what happened when the message got forwarded! Here are the links 
in a shorter form:

Time and Time Again: How Science and Culture Shape the Past, Present, and Future
Sara J. Schechner

PDF:  
https://itunes.apple.com/us/itunes-u/time-and-time-again/id1008852567?mt=10
iBook: https://itunes.apple.com/us/book/time-and-time-again/id977218203?mt=11


Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/




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FW: CHSI's new publication

[Schechner, Sara]

Dear Sundial Enthusiasts,

It is with great pleasure that I would like to bring to your attention this 
brand new publication from the CHSI. Two years ago we showcased an exhibition 
on time: Time  Time Again: How Science and Culture Shape the Past, Present, 
and Future (http://chsi.harvard.edu/chsi_tta.html).

Since the exhibition opened we had the idea of producing an eCatalog of the 
exhibition. It is with great pride that I announce today the completion of this 
task.

I have to underscore the immense amount of work put into this project by three 
people: Sara Schechner, our Curator, who wrote all the texts and carefully 
edited the volume; Samantha van Gerbig, our photographer  designer, who did 
the photography for the eBook; and Cira Louise Brown, who did all the 
programming, book design, and fixed all the bugs. It was a big endeavor, but 
the result is fantastic.

The book is free to download in two versions:

An iBook for your iPad (found on iTunes Book): 
https://itunes.apple.com/us/book/time-and-time-again/id977218203?mt=11https://urldefense.proofpoint.com/v2/url?u=https-3A__itunes.apple.com_us_book_time-2Dand-2Dtime-2Dagain_id977218203-3Fmt-3D11d=BQMFAwc=WO-RGvefibhHBZq3fL85hQr=QyOWE0U6_eWGmwVb9xsAuM9_jmi1IXL2VqSHTHTsGqwm=E3NE-RBJEjbYCUrrhKPSEbxxCAZhWFaxhyTFAVrxWC8s=Js2n3dCJgn0tIy6GtFSnFo5EwqCIF_prEJSW6zRzA2Ae=

A pdf for your computer and other devices (found on iTunes U): 
https://itunes.apple.com/us/itunes-u/time-and-time-again/id1008852567?mt=10https://urldefense.proofpoint.com/v2/url?u=https-3A__itunes.apple.com_us_itunes-2Du_time-2Dand-2Dtime-2Dagain_id1008852567-3Fmt-3D10d=BQMFAwc=WO-RGvefibhHBZq3fL85hQr=QyOWE0U6_eWGmwVb9xsAuM9_jmi1IXL2VqSHTHTsGqwm=E3NE-RBJEjbYCUrrhKPSEbxxCAZhWFaxhyTFAVrxWC8s=BBDqfy1xGfzbpzJBfvZnR3gT-CYnhj_wCNtYTw4htDYe=

Please download this book at your convenience and share the news!

Again, congratulations to Sara, Sammie, and Cira. All best jfg

Jean-François Gauvin, Ph.D.
Director of Administration / Lecturer

Harvard University | Collection of Historical Scientific Instruments
1 Oxford St, Science Center 371, Cambridge, MA 02138
Ph: 617.496-1021 | cell: 857.998-8523
gau...@fas.harvard.eduapplewebdata://BDC26683-FE1F-406A-82D7-88D3C3EBE1B9/gau...@fas.harvard.edu
http://chsi.harvard.eduhttp://chsi.harvard.edu/
jfgauvin2008.wordpress.com

Follow us on Twitter @harvardchsi
Follow us on Facebook: 
https://www.facebook.com/harvardchsihttps://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_harvardchsid=BQMFAwc=WO-RGvefibhHBZq3fL85hQr=QyOWE0U6_eWGmwVb9xsAuM9_jmi1IXL2VqSHTHTsGqwm=E3NE-RBJEjbYCUrrhKPSEbxxCAZhWFaxhyTFAVrxWC8s=bQaBGa_IQcdzv7oJ0VFjUsd1nogL0gJmUpk0qByq0Cwe=
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RE: CHSI's new publication

[Schechner, Sara]

Dear John,

Just to clarify, the PDF for my book is not read in iTunes, but only downloaded 
from a link there to your own computer.

However, if you prefer not to visit iTunes U to get that link, you can have it 
directly from this Dropbox:
https://www.dropbox.com/s/fj9b15yzef12gzt/TimeAndTimeAgain.pdf?dl=0
When you open the Dropbox, you will see the book PDF to be downloaded to your 
computer.  Do not try to read it in the Dropbox.

I hope you enjoy it!

Sara


From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of John Pickard
Sent: Wednesday, July 08, 2015 7:12 PM
To: sundial@uni-koeln.de
Subject: Re: CHSI's new publication

Good morning Sara,

Sounds like a great conclusion to a difficult project.

I’d really like to get the PDF, but I don’t want to download iTunes to read it. 
I have more than enough software on my computer, and I’d prefer to read a PDF 
in Acrobat not in iTunes or some other program. Do you have any suggestions for 
getting the PDF without going through iTunes?


Cheers, John

John Pickard
john.pick...@bigpond.commailto:john.pick...@bigpond.com
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RE: A new book (in Italian)

[Schechner, Sara]

Dear Gianni,
Where can the eBook (PDF) be ordered?

Best wishes,
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/https://urldefense.proofpoint.com/v1/url?u=http://www.altazimutharts.com/k=AjZjj3dyY74kKL92lieHqQ%3D%3D%0Ar=Y3uaNkd%2BN%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0Am=Ti1oQOLKwbdeBp0MOcYibsxY4Lg058dCGKYBaRLSNUY%3D%0As=2f04b2f3647abf5da1ada6decaf1b455ea2d0ead01efe881489e14a7d1adb139

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Gianni Ferrari
Sent: Sunday, May 10, 2015 1:37 PM
To: LISTA INGLESE
Subject: Re: A new book (in Italian)

Sorry,
I forgot to write that of my book exists
also the ebook (PDF) version : cost  10 €
Best regards
Gianni Ferrari

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RE: Telling time in outback Queensland in the early 20th century

[Schechner, Sara]

I very much enjoyed the link, John.  Thanks for sharing it.

Dear Rod,
Aboriginal people in Australia have a very different sense of time than 
Westerners do.  They have a sense of time as near and far.  Things near in 
time are not events that happened close in sequence, but events that are more 
important to the person.  Things far away in time are those that are less 
meaningful, even though they could have happened yesterday.   This is important 
for health care workers to know when interacting with traditional people.

I have some notes on this from an exhibition on Time, but perhaps others will 
find more up-to-date information online.

Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



-Original Message-
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of John Pickard
Sent: Saturday, March 07, 2015 6:11 PM
To: sundial@uni-koeln.de
Subject: Re: Telling time in outback Queensland in the early 20th century

Hi Rod,

Short answer: no!

Long answer: still no, but a bloke named Duane Hamacher (University of NSW) is 
the Australian guru on Aboriginal astronomy, and has published extensively on 
this. I haven't had time to trawl through his stuff to see what he says about 
telling time, but there may be something in his publications 
(http://www.nuragili.unsw.edu.au/profileduanehamacher.html)

FYI, I have a paper in press refuting a suggestion by a local Aborigine that 
stone walls near Jindabyne (southern NSW) were erected by Aborigines as an 
astronomical alignment.  They are dry stone walls erected as fences in 
difficult terrain. The European landowners may have used Aboriginal labour 
(paid a fraction of what whites were paid!), but there is no way that the walls 
are alignments. However, if you look at Hamacher's papers you'll find several 
which document stone arrangements which are astronomical.

Cheers, John

John Pickard
john.pick...@bigpond.com

-Original Message-
From: rodwall1234
Sent: Sunday, March 08, 2015 9:56 AM
To: John Pickard ; sundial@uni-koeln.de
Subject: Re: Telling time in outback Queensland in the early 20th century

Hi John,

Thanks that is interesting. I have always though about how our Australian 
Aboriginals determined time. Do you have any information on that?

Regards,

Roderick Wall.

John Pickard john.pick...@bigpond.com wrote:

Good afternoon,

List members may be interested in this account of how some 
boundary-riders in Queensland kept time in the early 1900s:

Many boundary-riders do not even possess a watch, their only 
timekeepers being the sun and the stars. Some judge by the shadows. I 
saw one who had pegs stuck in the ground, at a radius of 10ft, all 
round a tree. There were ten of them standing exactly one hour apart, 
so that the shade, lying across the first at 8 a.m., would be on the 
last at 5 p.m. A swagman with a watch had camped with him one Sunday, 
and between then they had constructed this crude sun-dial. Once when 
passing a camp, I asked the boundary-ride the time, and was amused at 
the manner in which he obtained it. Taking a small twig, he broke it 
into two pieces about 3in long, and, holding his left hand palm 
upwards, he stood one piece between the second and third fingers, and 
the other between the third and fourth. Then, facing due north, he held 
his hand straight out before him and I noticed that the shadows of the 
twigs were just a trifle east of a direct north and south line 'Bout, 
'alf-parst twelve, he said. 

http://nla.gov.au/nla.news-article71523046

A boundary rider was a station employee who lived far from the 
homestead, and whose job it was to ride along fences to check for 
breaks in the wire, etc.

Of course, telling the time with the 10-foot radius circle using the 
shadow of a tree would be as rough as guts (in the Australian 
vernacular), but it probably made little difference to the boundary 
rider. However, at least some early outback Australians understood the 
geometry of sundials. See my description of a dial made out of 
galvanised iron:

Pickard, J. (1998). A 19th century vernacular horizontal sundial from 
outback Australia. British Sundial Society Bulletin 98(1): 26-29.

Personally, I prefer using CIA-time via my GPSs. Not as much fun, but 
way more accurate.

Cheers, John

John Pickard
john.pick...@bigpond.com

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Dr. C. H. Lewis contact

[Schechner, Sara]

Dear Fellow Diallists,

I am looking for contact information for Dr. C. H. Lewis of Toronto, Canada, 
who had a scientific instrument collection in the 1960s, and may well still.  
His collection included a sundial of particular interest for my research.  If 
he is a member of this list, or if anyone knows of him or his family, please 
contact me offline.

Thanks for your help.

Sara Schechner

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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RE: Tallinn and Tartu, Estonia

[Schechner, Sara]

Dear Fabio,
Thanks for the recommendations to check the Sundial Atlas.  I will be attending 
a conference in Tartu from August 25-30, with the last day in Tallinn.  It is 
the http://sic2014.ut.ee/.  I will check for sundials in the Tartu museums, but 
 I regret that it will be hard to meet up with you.

Best wishes,
Sara


-Original Message-
From: Fabio [mailto:fabio.sav...@nonvedolora.it] 
Sent: Wednesday, August 20, 2014 3:07 AM
To: Schechner, Sara
Cc: sundial@uni-koeln.de
Subject: R: Tallinn and Tartu, Estonia

Dear Sara
I'm in Estonia now and I'm travelling trough the country.
I found 41 sundials till now, you can watch them on Sundial Atlas.
Some of them are in the museums and they are very interesting, especially those 
in Tartu.
I started from Tallinn, now I'm in the islands and I'll be again in Tallinn on 
the 25th. If you wish direct impressions about the sundials, and also the 
Estonia, I'll be glad to meet you, anyway you can write me for any other info 
about the sundial you'll find on Sundial Atlas.
 
Ciao Fabio

Fabio Savian
fabio.sav...@nonvedolora.it


-- msg. originale --
Oggetto: Tallinn and Tartu, Estonia
Da: Schechner, Sara sche...@fas.harvard.edu
Data: 19/08/2014 21:00

Hi all,
Next week I will be in Estonia, mostly in Tartu with a day in Tallinn.  Does 
anyone know of interesting sundials to see there?



Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments Department of the History of Science, Harvard University Science 
Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/




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Tallinn and Tartu, Estonia

[Schechner, Sara]

Hi all,
Next week I will be in Estonia, mostly in Tartu with a day in Tallinn.  Does 
anyone know of interesting sundials to see there?



Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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RE: unique French diptych dial

[Schechner, Sara]

Dear Maciek,
Thanks for sharing these images and link.  What a fabulous diptych!  I could 
not find a maker’s mark on it by inspecting the photos.  Do you know if it was 
stamped or marked in any way, save for the epact date of 1598?   Did the 
auctioneer or anyone else identify the coat of arms?

Best wishes,
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of 
ml...@interia.pl
Sent: Saturday, July 26, 2014 5:19 PM
To: sundial@uni-koeln.de
Subject: unique French diptych dial


Dear Diallists,

The topic of the last, Jubilee edition of the BSS Bulletin is “decoration on 
sundials”.
Interestingly, as post scriptum for Bulletin’s topic, in local French auction 
house sale recently appeared an unusual and early diptych sundial of most 
attractive look and complex furniture.

Please find below link to my dropbox folder with detailed photos obtained by 
the courtesy of the auction house SVV DUPONT  Associés: 
https://www.dropbox.com/s/m7clcl1w3f3rcrr/diptych%20dial.ziphttps://urldefense.proofpoint.com/v1/url?u=https://www.dropbox.com/s/m7clcl1w3f3rcrr/diptych%2520dial.zipk=AjZjj3dyY74kKL92lieHqQ%3D%3D%0Ar=Y3uaNkd%2BN%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0Am=E1LrTg4TGA2zeq7cqBqqMjgn5avebzhqPITyzKrY5Ag%3D%0As=a7bb905393baec803d2e66711ba20274d027378561afdd89d0f0d5f9479898e9
The instrument, based on the inscription relating to epacts can be dated late 
16th century and is unique example by many means – substantial size 19.5 x 11.8 
cm, quality of engraved decoration rarely seen on ivory due to limitations 
coming from material characteristics and very complex furniture. Interestingly 
it doesn’t follow Dieppe patterns, being closer to Nuremberg dials – but in 
many respects its style is unique.
The dial, despite holiday time, local French auctioneer and its incompleteness, 
was sold today well above 50k Euros ! It is likely that it was bought by a 
private collector and may not be exposed to public, so I wanted to share it 
with You as it looks obviously to be an important example of a diptych and of 
enigmatic origin.
I hope that French diallists will study it in detail and drop us some more 
light on it !
Good viewing,
Maciek Lose

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RE: unique French diptych dial

[Schechner, Sara]

Other beautifully engraved French ivory diptych dials can be seen in the 
exhibition catalogue, Cadrans Solaires / Sundials, by Dominique and Eric 
Delalande, Paris, 2013.

Best,
Sara

-Original Message-
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of araignee
Sent: Sunday, July 27, 2014 5:06 PM
To: ml...@interia.pl; Sundial list
Subject: Re: unique French diptych dial

Dear Maciek et al,

Yes, most of the Bloud and Bloud-type dials from Dieppe have punched markings, 
and were made in large numbers.  But there are certainly exceptions, perhaps 
the most striking being the huge, hand-engraved, 18x22 cm, 1.6 kilo Bloud 1653 
at Harvard, described in Lloyd's book.

And see 
http://dssmhi1.fas.harvard.edu/emuseumdev/code/emuseum.asp?style=browsecurrentrecord=13page=searchprofile=objectssearchdesc=bloudquicksearch=bloudsessionid=ED9682B9-9ECF-439D-A55D-0BDA3FB9E1B9action=quicksearchstyle=singlecurrentrecord=16

Regards,
David


David Coffeen, Ph.D.
TESSERACT
Box 151
Hastings-on-Hudson, NY 10706
1-914-478-2594
m...@etesseract.com
www.etesseract.com


On Jul 27, 2014, at 3:37 PM, ml...@interia.pl wrote:

 Dear All,
 
 The technique of manufacturing of this dial is very specific – it is all 
 engraved, unlike Dieppe or Nuremberg dials on which many markings (numerals, 
 sigils, decoration patterns etc.) were normally punched. This implies that 
 the dial didn’t come from the workshop specialized in mass production of the 
 diptych dials. It rather seems to be unique custom product, resulting from 
 cooperation of very skilled engraver and mathematician.
 I’m not expert in heraldry – but short internet research brought me to 
 the website of the Gaudel family, which coat of arms seems to match 
 closely the one depicted on the dial (despite wavy pattern inside 
 reversed “V”): 
 http://genealogie.gaudel.pagesperso-orange.fr/chatel.htm
 
 There is some sort of signature, above the vertical dial of the inner 
 face, it reads: “anthonn “ and “yuec” (fec.? fecit?)  Please see image 
 No. 11 at https://www.dropbox.com/s/m7clcl1w3f3rcrr/diptych%20dial.zip
 
 Maciek Lose
 
 
 
 Od: Schechner, Sara sche...@fas.harvard.edu
 Do: ml...@interia.pl ml...@interia.pl; sundial@uni-koeln.de 
 sundial@uni-koeln.de;
 Wysłane: 20:42 Niedziela 2014-07-27
 Temat: RE: unique French diptych dial
 
 
 Dear Maciek,
 Thanks for sharing these images and link.  What a fabulous diptych!  I could 
 not find a maker’s mark on it by inspecting the photos.  Do you know if it 
 was stamped or marked in any way, save for the epact date of 1598?   Did the 
 auctioneer or anyone else identify the coat of arms? 
 
  
 Best wishes,
 Sara
 
  
 
  
 Sara J. Schechner, Ph.D.
 David P. Wheatland Curator of the Collection of Historical Scientific 
 Instruments Department of the History of Science, Harvard University 
 Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
 Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
 http://scholar.harvard.edu/saraschechner
 http://chsi.harvard.edu/
 
  
 
  
 
  
 From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of 
 ml...@interia.pl
 Sent: Saturday, July 26, 2014 5:19 PM
 To: sundial@uni-koeln.de
 Subject: unique French diptych dial
 
  
 Dear Diallists,
 
 The topic of the last, Jubilee edition of the BSS Bulletin is “decoration on 
 sundials”. 
 Interestingly, as post scriptum for Bulletin’s topic, in local French auction 
 house sale recently appeared an unusual and early diptych sundial of most 
 attractive look and complex furniture. 
 
 Please find below link to my dropbox folder with detailed photos 
 obtained by the courtesy of the auction house SVV DUPONT  Associés: 
 https://www.dropbox.com/s/m7clcl1w3f3rcrr/diptych%20dial.zip
 
 The instrument, based on the inscription relating to epacts can be dated late 
 16th century and is unique example by many means – substantial size 19.5 x 
 11.8 cm, quality of engraved decoration rarely seen on ivory due to 
 limitations coming from material characteristics and very complex furniture. 
 Interestingly it doesn’t follow Dieppe patterns, being closer to Nuremberg 
 dials – but in many respects its style is unique. 
 The dial, despite holiday time, local French auctioneer and its 
 incompleteness, was sold today well above 50k Euros ! It is likely that it 
 was bought by a private collector and may not be exposed to public, so I 
 wanted to share it with You as it looks obviously to be an important example 
 of a diptych and of enigmatic origin.
 I hope that French diallists will study it in detail and drop us some more 
 light on it !
 Good viewing,
 Maciek Lose
 
  
 
 
 ---
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RE: Eternal Sundial

[Schechner, Sara]

Cool photoshop effect!

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Robert 
Terwilliger
Sent: Friday, June 06, 2014 7:21 AM
To: sundial@uni-koeln.de
Subject: Eternal Sundial

Found on Flickr:

https://www.flickr.com/photos/davidmontse/3166570780/

Also
https://www.flickr.com/photos/davidmontse/3166570782/in/photostream/

Bob
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RE: Request for information about a type of altitude dial

[Schechner, Sara]

There has been some confusion in the discussion so far.  Here is my take:

The sundial pictured is called a “vertical disk dial.”  It is an altitude 
sundial.
The example pictured is similar to one at CHSI (inv. 7270) signed “I W” with a 
punch mark of a crown and date 1672.  It is for latitude 52° 35'.

Most of the vertical disk dials are for single latitudes, and have a single 
suspension point.  However, a few try to be adjustable for latitude.  At 
Harvard, an example is inv. 7264, which is signed and dated “ P. L. K. / 1755.”

I will tweet images of them and post them in this Dropbox:  
https://www.dropbox.com/sh/9qg1p0kejm3o842/AACoYez5bVtRU5JhPJuJgOK8a

Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


On Sun, Jun 1, 2014 at 6:13 PM, Steve Lelievre 
steve.lelievre.can...@gmail.commailto:steve.lelievre.can...@gmail.com wrote:
Hi folks,

http://www.pinterest.com/pin/301178293801331061/https://urldefense.proofpoint.com/v1/url?u=http://www.pinterest.com/pin/301178293801331061/k=AjZjj3dyY74kKL92lieHqQ%3D%3D%0Ar=Y3uaNkd%2BN%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0Am=izSTWMgNnFv8DfKU%2Bd249F%2B%2FyJSDHvIkXOyVUqkC8%2FU%3D%0As=7631973f481f1363e8d75a48591133eaed99295b1faf9d05a8f4a1ea4c25175d

What type of dial is this; I realize it's a form of altitude dial, but is there 
a specific name for it?

The accompanying note states that the dial can be adjusted for latitude by 
moving the attachment point. I don't understand which part of the mechanism 
does that. Can anyone explain it for me?

Lastly, I'm appreciate references for articles or webpages that discuss these 
dials - history and mathematics.

Thanks,
Steve







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Capuchin sundial --earliest name use

[Schechner, Sara]

Dear All,
I am searching for the earliest use of the name, Capuchin dial, to describe a 
particular form of rectilinear dial.

The class of altitude /rectilinear dials also includes the Regiomontanus dial 
and navicula.  The earliest published projection of the Capuchin dial I know is 
in the works of Sebastian Munster in the 1530s, but he does not call it by that 
name.   At some point it came to be known by the Capuchin name because when 
turned upside down the project resembles the hood of a Capuchin monk.

So when before 1800 did this naming convention happen?

Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/https://urldefense.proofpoint.com/v1/url?u=http://www.altazimutharts.com/k=AjZjj3dyY74kKL92lieHqQ%3D%3D%0Ar=Y3uaNkd%2BN%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0Am=Ti1oQOLKwbdeBp0MOcYibsxY4Lg058dCGKYBaRLSNUY%3D%0As=2f04b2f3647abf5da1ada6decaf1b455ea2d0ead01efe881489e14a7d1adb139

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/


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Sundial of the Week tweet

[Schechner, Sara]

Hi everyone,

Many of you know that I have been cataloguing the sundials at Harvard's 
Collection of Historical Scientific Instruments and the Adler Planetarium.  For 
fun, I will begin tweeting each week about a particularly interesting sundial 
on which I am working.   Those of you in the Twitterverse can follow me at 
@SaraSchechner.   I hope you will enjoy the images.  The first tweet will be 
next week.

Happy dialing!
Sara

Sara J. Schechner
Altazimuth Arts
42°36'N   71° 22'W
West Newton, MA 02465
http://www.altazimutharts.com/

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/



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online manuscript by Mayall and Mayall

[Schechner, Sara]

Dear All,

As those who attended last summer's meeting of the North American Sundial 
Society know, I have done some research on the Margaret Mayall and R. Newton 
Mayall, authors of the well-known, Sundials:  How To Know, Use, and Make Them, 
and their connections to sundials presently in Harvard's Collection of 
Historical Scientific Instruments.  My research paper has not yet been 
published.

One of the manuscripts I have used was a typescript catalog of the Ernst 
Collection by the Mr. and Mrs. Mayall.  The document is held at the Harvard 
College Observatory.  It was recently digitized and is now available online.  
You can find it here:

The Harold C. Ernst Collection of Portable Sundials
Mayall, R. Newton
Mayall, Margaret W.
http://zenodo.org/record/8326

Best wishes,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner/
http://chsi.harvard.edu/


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RE: SCOTTISH SUNDIAL

[Schechner, Sara]

I dislike judging things from photographs rather than in person, but to me this 
looks like a fake (something pretending to be what it is not) and not a 
reproduction.The lettering is not convincing-too many styles, ones wrong 
for the period, the hour numerals reversed from the usual, the use of Ye, 
etc.   Typical sundials don't put a wind rose under the gnomon.

Cheers,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner/
http://chsi.harvard.edu/





From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Dennis Cowan
Sent: Tuesday, January 21, 2014 4:37 PM
To: sundial@uni-koeln.de
Subject: SCOTTISH SUNDIAL

I wonder if anyone on the list can help?  I received photos of this sundial 
from a lady in the USA.  She aquired it whilst she lived in Scotland some 
twenty odd years ago.  I'm trying to trace the possible origins for her.  I am 
not sure if the date of 1684 is genuine as it looks quite fresh, but a 
reproduction would surely use a known motto and I have never heard of this one 
Ye Shade Teecheth.  The compass is also unusual to me.  Does anyone have any 
opinions?

Is it original or a reproduction.?  Does anyone recognise the motto or style of 
compass?

Many thanks

Dennis Cowan
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sundial exhibit in Paris

[Schechner, Sara]

Dear All,
The Galerie Delalande will be hosting an exhibition of about 150 remarkable 
sundials of great beauty and rarity in its Paris showroom from 17 December 2013 
to 19 January 2014.   A full-color catalogue in French and English is available 
and can be ordered by following the link 
http://www.delalande-antiques.com/exhibition-sundials-paris/book-sundials.html. 
   I recently had the opportunity to see many of the items being loaned by 
private collectors to this show.   I recommend both the exhibition and 
catalogue highly.

See below for details.

Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://scholar.harvard.edu/saraschechner
http://chsi.harvard.edu/

Notice from 
Galerie Delalande-

GALERIE DELALANDE
Louvre des Antiquaires
2, Place du Palais-Royal
75001 Paris - France
Tél./fax: + 33 1 42 60 19 35
www.antiquites-delalande.frhttp://www.antiquites-delalande.fr/
www.delalande-antiques.comhttp://www.delalande-antiques.com/
email : domdelala...@hotmail.commailto:domdelala...@hotmail.com


Object: Exhibition on Pocket and table sundials from Renaissance times to 
XIXth century.

Localisation: Gallery Delalande in Louvre des Antiquaires Paris

Period: From Tuesday 17th December 2013 till Sunday 19 January 2014 included.

Target:

Create an international event by exhibiting a numerous amount of high quality 
pocket and table sundials, around 150 (30 being from Renaissance times), making 
this exhibition unique in the world, hardly done in the past.

Indeed, it has never been possible before to assemble such a numerous numbers 
of sundials of that quality, coming from various countries and makers:


a) Germany / Austria :
- Bergauer,
- Hager,
- Heinrich Muller,
- Karner,
- Lesel,
- Linden,
- Martin,
- Martin Willebrand,
- Miller,
- Purmann,
- Reinman,
- Rugendas,
- Schniep,
- Troschel,
- Tucher,
- Vetter,
- Voigtlander,
- Willebrand,...

b) France / Flanders
- Baradelle,
- Blondeau,
- Bloud
- Butterfield,
- Canivet,
- Chapotot,
- Chesnon,
- Coignet,
- Cremstorff,
- Danfrie,
- Delure,
- Dujardin,
- Greban,
- Guibout,
- Langlois,
- Laurier,
- Lefebvre,
- Lemaire,
- Macquart
- Norry,
- Noury,
- Thoury,
- Sevin,
- Zeelst
c) Italy including Lusuerg, Vulpariae, etc...

d) Persian, etc...

e) English with Cole...

All sundials being in :

- different materials : ivory, silver, brass, painted wood, silver gilt and gold

- different shapes : horizontal, vertical, oval, square, polyhedral, cubic, 
cross, etc...

- and different sizes : small, medium, outstanding

Accompanied with a French / English full-detailed book including coloured 
pictures (around 430 pages).

For your information, a numerous number of exceptional sundials will be for 
sale during the exhibition, which will be a unique possibility to complete your 
collections of sundials with some exceptional ones.


Gallery Delalande references :


A)Expertise and Partnerships

- Administrator and Expert in marine, tobacco and opium, member of the French 
Experts National Company (Compagnie Nationale des Experts)
- Syndicat National des Antiquaires member
- Yacht Club de France member
- Collaboration with national, european and international museums
- Exclusive partner of the French Maritime Museum associations
- Showcase at the Ritz Hotel, Place Vendome, Paris (in works at the moment)

B)Galleries and exhibitions

- at Paris Louvre des Antiquaires since its opening in 1978
- TEFAF Maastricht showcase participation in March 2013
- Marine stands at the Biennales des Antiquaires in the Paris Grand Palais 
1982-84-86-88 and September 2012 (please visit our stand on our websites)
- Marine stand at the Salon du Collectionneur in the Paris Grand Palais 2009
- Gallery in Place des Antiquaires New York 1987-1993
- Exhibition La Fleur du Mal on tobacco artefacts over five centuries at 
Trianon de Bagatelle Paris during six months in 1994/95 including the writting 
of a reference book on the matter
- Exhibition Memories of Opiums at Le Louvre des Antiquaires Paris (September 
- December 2011) with a reference book Memories of Opiums written in French and 
English.
- Exhibition Pocket and Table sundials at Le Louvre des Antiquaires Paris
(17 December 2013 - 19 January 2014) with 150 sundials exhibited (30 being made 
before 1600 in the Renaissance times).


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A special soirée at the Collection of Historical Scientific Instruments

[Schechner, Sara]

Dear History of Science Community,

The Collection of Historical Scientific Instruments (CHSI) at Harvard 
University would like to invite you to an informal gathering during this year's 
HSS Annual Meeting, held in Boston. We will open our museum doors on Friday, 22 
November 2013 from 7:30pm to 9:30pm. Wine and cheese will accompany the visit 
of our two current exhibits: Time, Life  Matter: Science in Cambridge AND Time 
 Time Again: How Science  Culture Shape the Past, Present,  Future. For more 
information, go to our website: 
http://www.fas.harvard.edu/~hsdept/chsi-exhibitions.html

We are located on the Oxford Street side of the Science Center at Harvard 
University:

Collection of Historical Scientific Instruments
Science Center 136 and 251
1 Oxford Street, Cambridge, MA.
(map: http://hmsc.harvard.edu/files/museums/files/hmsc_map.pdf)

Please join us for this special occasion. We are eager to see old friends and 
make new ones!

Please RSVP to either Dr. Sara Schechner 
(sche...@fas.harvard.edumailto:sche...@fas.harvard.edu) or myself, your two 
hosts.

Looking forward to seeing you in great number. All the best, jfg

Jean-François Gauvin, Ph.D.
Director of Administration / Lecturer

Harvard University | Collection of Historical Scientific Instruments
1 Oxford St, Science Center 371, Cambridge, MA 02138
Ph: 617.496-1021 | cell: 857.998-8523
gau...@fas.harvard.eduapplewebdata://701ACC2A-7219-46D1-A912-3F24590A12B8/gau...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html
jfgauvin2008.wordpress.com

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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RE: Shape of Greek and Roman sundials

[Schechner, Sara]

Dear Sasson,

Your sundial looks pretty, but it does not seem cylindrical to me in the photo.

As for your questions concerning the preference of the Greeks and Romans to 
concave spherical sundials, there are several answers:


1. The bowl mirrored the spherical shape of the heavens, and this was 
satisfying from a cosmological and philosophical standpoint.



2. Finding time to the hour was accurate enough for public lives, and 
indeed, many thought it was more of a bother to divide the day into twelve 
parts.  Other cultural divisions of the day were also in use, and had names 
like, the time of the cock crowing.



3. It is a misconception to think that the Greeks and Romans strongly 
preferred concave sundials.  Perhaps the most famous of Greek sundials is the 
Tower of the Winds in Athens.  It has eight vertical sundials with pin gnomons. 
  The most famous Roman sundial was likely the large horizontal azimuth dial in 
Rome which used an Egyptian obelisk for a gnomon.  Romans also used altitude 
dials, including the pillar dial.

Cheers,
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Sasson Kaufman
Sent: Tuesday, October 22, 2013 6:40 AM
To: sundial@uni-koeln.de
Subject: Shape of Greek and Roman sundials

Hi.

Greek and Roman sundials measured temporal time. They were generally spherical 
or conical, and, if I understand correctly, their surface was designed to 
provide a mirror image of the sun's paths in the sky throughout the different 
seasons. These paths, whether short or long, were then divided into twelve 
ostensibly equal parts. Yet this seems rather odd, since the sun's orbit 
remains at the same tilt (depending on altitude) throughout the year, only 
going back and forth, thus creating the shape of a tilted tunnel or cylinder. 
If the objective of the dial was to divide the day into equal hours, wouldn't 
it have been more appropriate for the surface of the dial to be that of the 
inner part of a cylinder? Shaping the surface as a sphere or cone would 
seemingly distort the shape of the sun's path projected on the surface and 
complicate the calculations for line plotting. This leads me to suspect that 
the ancient dials were of limited accuracy.

With this question in mind, I recently created a portable dial (see the 
attached image) with a cylindrical surface tilted according to latitude, and so 
far, to the best of my reckoning, it's precise to about a minute. The dial was 
created using TinkerCad, and printed in 3d.

Plotting the lines for my dial was fairly simple using paper. I created a 2d 
insert equal in shape to that of the cylinder surface, divided it into 12 
equal-width parts, and glued it to the dial. I haven't found though the formula 
to do this in 3d.

My questions-

- Why did the Greeks and Romans prefer spheres and cones over cylinders which 
presumably would have been more accurate and simpler to plot the lines on?

- Would anyone here have an idea how to plot the lines for my dial using a CAD 
program?

Thanks in advance,

Sasson Kaufman
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RE: Shape of Greek and Roman sundials

[Schechner, Sara]

Thanks for the clarification, Mario.  I had thought that the seasonal lines had 
been found but must have been mistaken.

Sara

42°36'N   71° 22'W
West Newton, MA 02465



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Mario Arnaldi
Sent: Tuesday, October 22, 2013 2:41 PM
To: sundial@uni-koeln.de
Subject: Re: Shape of Greek and Roman sundials

It has eight vertical sundials with pin gnomons.   The most famous Roman 
sundial was likely the large horizontal azimuth dial in Rome which used an 
Egyptian obelisk for a gnomon.  Romans also used altitude dials, including the 
pillar dial.


Dear Sara I understand that you are meaning the Augustus' sundial. If it is so, 
I would point out that it is already clear for many scholars that that dial was 
not a sundial but only a meridian line. The idea of the azimuthal shape maybe 
is from a 18th or 17th century engraving, but it is a fantasy figure, of course.

Mario

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RE: Analemmatic and Horizontal Sundials of the Bronze Age (NorthernBlack Sea Coast)

[Schechner, Sara]

Yes, that is the link to the full article from the page I sent earlier.
I would like to know what religious or social reasons the users of the alleged 
sundial had for so precisely wanting the time in a non-urban setting.

Sara

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Fabio 
nonvedolora
Sent: Tuesday, October 01, 2013 3:46 AM
To: sundial@uni-koeln.de
Subject: Re: Analemmatic and Horizontal Sundials of the Bronze Age 
(NorthernBlack Sea Coast)

dear Sarah

’With the help of mathematical and astronomical methods we prove ...’
without images this introduction is useful to corroborate the conclusion but 
something is lost in the middle, so I search on google and I found this

http://arxiv.org/ftp/arxiv/papers/1309/1309.7238.pdf

ciao Fabio

Fabio Savian
fabio.sav...@nonvedolora.itmailto:fabio.sav...@nonvedolora.it
www.nonvedolora.euhttp://www.nonvedolora.eu
Paderno Dugnano, Milano, Italy
45° 34' 10'' N, 9° 10' 9'' E, GMT+1 (DST +2)

From: Schechner, Saramailto:sche...@fas.harvard.edu
Sent: Monday, September 30, 2013 7:54 PM
To: mailto:sundial@uni-koeln.de
Subject: FW: Analemmatic and Horizontal Sundials of the Bronze Age 
(NorthernBlack Sea Coast)

I was just sent this from another list, and thought I would pass it along.  I 
have not yet had time to read it closely, but my first impression is that it is 
farfetched.  I would be interested in hearing what others think.

http://arxiv.org/abs/1309.7238


Sara Schechner

42°36'N   71° 22'W
West Newton, MA 02465




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FW: Analemmatic and Horizontal Sundials of the Bronze Age (Northern Black Sea Coast)

[Schechner, Sara]

I was just sent this from another list, and thought I would pass it along.  I 
have not yet had time to read it closely, but my first impression is that it is 
farfetched.  I would be interested in hearing what others think.

http://arxiv.org/abs/1309.7238


Sara Schechner

42°36'N   71° 22'W
West Newton, MA 02465



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RE: A very fine portable equatorial dial

[Schechner, Sara]

Dear Bob,
Thanks for posting this.   I am currently researching sundials made in Europe 
for American customers.   It is an interesting sundial-clearly French, very 
similar to one signed by Moreau, Paris, in the Adler Planetarium.  That example 
also has Latin American and Caribbean locales.  Gluck Optico, Mexico also made 
(or perhaps just sold) this type of sundial, with, of course, local places on 
the gazetteer.

Cheers,
Sara

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Robert 
Terwilliger
Sent: Thursday, May 23, 2013 7:42 PM
To: sundial@uni-koeln.de; de3c...@aol.com
Subject: A very fine portable equatorial dial

A friend of mine came across a very nice portable equatorial dial. Other than 
being well made, it is interesting in that all the location engraved on the 
dial except one, are in the western hemisphere, mostly in or around Mexico or 
in the Caribbean.

I made a web page:

http://www.twigsdigs.com/sundials/portable/portable.html

Bob


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RE: Egyptian sundials

[Schechner, Sara]

Traditionally the L-shaped instrument has been called a merkhet.  It was used 
not only as a plumb line and altitude sundial but more importantly for finding 
time at night.  For this purpose, two people were involved.  On to hold the 
merkhet to mark a meridian and another to sight through a notch in a palm-like 
paddle.   The timing of key stars crossing the meridian marked the hour.  The 
stars were known as decans.

Another example of the merkhet is at the Oriental Institute in Chicago.

Cheers,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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RE: Alt Augsburg revisited

[Schechner, Sara]

These astronomical clocks are part of a tradition of elaborate and complex 
clocks that showed all sorts of astronomical information.  They are largely 
found in courtly collections put together in the 16th and 17th centuries.  The 
inclusion of sundials on them was common in order to set the time of the clock.

A fine collection of clocks by Jost Burgi and others is found in Kassel:
http://www.museum-kassel.de/index_navi.php?parent=1412
http://www.museum-kassel.de/sic2011/?parent=5108

And in Dresden: Mathematisch Physikalischer Salon
http://www.skd.museum/de/museum-erleben/skd-mediathek/skd-videos/tuermchenuhr-mit-automatenwerk/index.html
http://www.skd.museum/de/museen-institutionen/zwinger-mit-semperbau/mathematisch-physikalischer-salon/die-neue-dauerausstellung/index.html

(not much is online but there are some great books)
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Bill Gottesman
Sent: Friday, April 26, 2013 9:19 AM
To: Robert Terwilliger
Cc: Sundials List
Subject: Re: Alt Augsburg revisited

I will start a guess.  I think the Hour hand below the gnomon was to be set 
manually by the user to align with the shadow line from the gnomon.  This hand 
was mechanically linked to the central clock dial minute hand, to show minutes 
past the hour.  In this manner, a user would use the sundial to get a close 
estimate of the exact time, told by an hour hand and a minute hand.  There 
exist other less complicated examples of German dials using a minute hand 
mechanically linked to some kind of moveable shadow indicator.

The other clock dials seem to show day-of-week and day of month, and maybe a 
lunar calendar as well.  Maybe there is an equation of time mechanism as part 
of the calendar, but I can not tell.  How these would function, I have no idea, 
but I can't imagine that they were mechanically linked to the sundial.

-Bill

On Fri, Apr 26, 2013 at 8:37 AM, Robert Terwilliger 
b...@twigsdigs.commailto:b...@twigsdigs.com wrote:
I find it curious that nobody chose to respond to, or comment on, the 
instruments illustrated in the book Kunstuhrmacher in Alt Augsburg

I put images online at:

http://www.twigsdigs.com/sundials/kunstuhrmacher/kunstuhrmacher.htm

These instruments had to be expensive, and since there seem to be a few 
surviving, somebody must have purchased and used them.

I have a l lot of questions.

 How were these instruments used?
 Were they to be used in sunlight?  If not, what was the gnomon for?
 How and why did the single hand indicate the hours from VI to VI?
  What happened at night?
Two of them have the sundial-style line and curves to indicate 
declination/astrological sign.
  How did this work?

Is it possible that these instruments were so early that the makers gave them 
the appearance of sundials to give the impression of accuracy to users who 
previously knew only sundials as time keepers?

The first instrument illustrated is the only horizontal one and it appears to 
have been photographed from the north. It also has a dial (the left one) 
divided into eight segments with engraved illustrations and Latin text I wonder 
what that's about

Until seeing these photographs I didn't know such things existed.

Bob



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new Time exhibition at Harvard

[Schechner, Sara]

Please forward.   Press release with images can be found here:  
http://www.fas.harvard.edu/~hsdept/docs/Time_and_Time_Again_PR.pdf


Explore the concept of time at Harvard's Collection of Historical Scientific 
Instruments and in unexpected places on campus!  It's all part of a new 
exhibition running from March 6 to December 6, 2013 at Harvard.

Time and Time Again
How Science and Culture Shape the
Past, Present, and Future

Time:  We find it, keep it, measure it, obey it, rely on it, waste it, save it, 
chop it and try to stop it.  We organize our lives around it, and yet, do we 
really know what time is?
Drawing upon collections in Harvard's scientific, historical, archaeological, 
anthropological, and natural history museums and libraries, this exhibition 
explores the answers given to that question in various ages by different world 
cultures and disciplines.
Themes include time finding from nature and time keeping by human artifice.  
Visitors will explore cultural beliefs about the creation and end of time, the 
flow of time, and personal time as marked by rites of passage.  They will take 
time out and examine the power of keeping time together in music, dance, work, 
and faith.  They will discover time's representation in history and objects of 
personal memory, its personification in art, and its expression in biological 
change and the geological transformations of our planet.
Featured objects include portable sundials and precision clocks, calendars from 
different cultures and epochs, time charts shaped like animals, Mesopotamian, 
Native American, and African ritual objects, fossils, metamorphosing creatures, 
and Julia Child's stopwatch.
But don't stop here
TIME TRAILS
A free smartphone app using geo-location leads visitors beyond the primary 
exhibition in the Science Center to other intriguing sites on the Harvard 
Campus.   They can explore the concepts of time as they are revealed in 40 
thought-provoking objects specially marked with a timepiece label throughout 
the galleries of all four of the Harvard Museums of Science and Culture.
Download the app here:  http://www.fas.harvard.edu/~hsdept/tta_timetrails.html.

And check out our website to see upcoming events related to time!  
http://www.fas.harvard.edu/~hsdept/chsi_tta.html.

The exhibition was curated by Sara J. Schechner, the David P. Wheatland Curator 
of the Collection of Historical Scientific Instruments, with assistance from 
Samantha van Gerbig, designer and photographer, and Noam Andrews, Wheatland 
Curatorial Fellow.   Financial support for this exhibition was generously 
provided by the David P. Wheatland Charitable Trust, the Provostial Fund 
Committee for the Arts and Humanities at Harvard University, and an anonymous 
donor.

About the Harvard Collection of Historical Scientific Instruments

The Collection of Historical Scientific Instruments preserves and documents 
over 20,000 instruments portraying the history of science teaching and research 
at Harvard from the Colonial period to the 21st century.  Through lively 
exhibit and teaching programs, research activities and cultural initiatives 
engaging many academic disciplines, the museum is both a specialized 
institution and an experimental space, where Harvard Faculty and students, 
instrument scholars and museum experts meet in the production of object-based 
knowledge.
One of the four Harvard Museums of Science and Culture, the Collection of 
Historical Scientific Instruments is located in the university's Science Center 
at 1 Oxford Street, Cambridge, just a five-minute walk from the Harvard Square 
T station.  The museum's Putnam Gallery is open 11 am to 4 pm on weekdays, and 
the Special Exhibition Gallery is open 9 am to 5 pm on weekdays.   Admission is 
free.  For more information, please visit the website 
http://www.fas.harvard.edu/~hsdept/chsi.html  or call 617-495-2779.

MEDIA CONTACTS
Jean-François Gauvin, Director of Administration, 
gau...@fas.harvard.edumailto:gau...@fas.harvard.edu , 617-496-1021
Sara Schechner, David P. Wheatland Curator, 
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu , 617-496-9542


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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RE: Horas benedictinus

[Schechner, Sara]

Dear Darek,
By horas benedictinus, he means the hours according to the Benedictine 
Rule--better known as the hours of the divine office.  These are unequal 
hours used by the monks for the times of prayer:  prime,..., 
tercesext...nones...etc.   The Catholic church used these hours in 
regulating masses and other prayer services.

Sara

42°36'N   71° 22'W 
West Newton, MA 02465



-Original Message-
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Darek Oczki
Sent: Wednesday, April 10, 2013 9:32 AM
To: sundial@uni-koeln.de
Subject: Horas benedictinus

An archeologist discovered a very old sundial on a church in a small village in 
south of Poland. It is a scratch dial with no gnomon nor any hour markings 
except for a few lines and a hole in the middle. As good as I could I tried to 
describe this kind of dials giving other examples found in this area. He seemed 
to be satisfied however he asked if the dial could be related to HORAS 
BENEDICTINUS. This terms is new to me. Could someone help me understand this, 
please? What does it refer to?

-- 
Best regards
Darek Oczki
52N 21E
Warsaw, Poland

GNOMONIKA.pl
Sundials in Poland
http://gnomonika.pl
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RE: Sundial At Tower Court, Wellesley College

[Schechner, Sara]

I have not been able to find an original from which this was copied.  It has 
made me wonder whether this is some sort of pastiche.

Sara

42°36'N   71° 22'W
West Newton, MA 02465



From: JOHN DAVIS [mailto:john.davi...@btopenworld.com]
Sent: Sunday, March 31, 2013 5:37 PM
To: Tony Moss; sundial@uni-koeln.de; Schechner, Sara
Subject: RE: Sundial At Tower Court, Wellesley College

Hi Sara,

Your idea of writing up the Wellesley College dial is a good one - I for one 
would like to know the full story and read your experiences.

The replica dial isn't a bad attempt (other than that awful gnomon!) and 
appears to have been hand engraved. But the details of the Equation of Time 
scale are missing and the half-hour fleur-de-lys don't have the shape I would 
expect for a Cole dial. Do you know if the original dial plate still exists?

Best regards,

John


Dr J Davis
Flowton Dials

--- On Sun, 31/3/13, Schechner, Sara 
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu wrote:

From: Schechner, Sara sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
Subject: RE: Sundial At Tower Court, Wellesley College
To: Tony Moss tonylindi...@talktalk.netmailto:tonylindi...@talktalk.net, 
sundial@uni-koeln.demailto:sundial@uni-koeln.de 
sundial@uni-koeln.demailto:sundial@uni-koeln.de
Date: Sunday, 31 March, 2013, 19:54

The dial plate is a reproduction of the early 20th century, and the gnomon a 
messed up replacement!



I have been thinking of writing this up with the Team for the NASS Compendium 
as a short article on how to approach a dial found in the field.   Would that 
be of interest to others?



Cheers,

Sara



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Tony Moss
Sent: Sunday, March 31, 2013 2:22 PM
To: sundial@uni-koeln.de
Subject: Sundial At Tower Court, Wellesley College



http://www.dickkoolish.com/rmk_page/pictures_112312.html 

A very fine dial plate but oh what a sad, sad, gnomon.

Tony Moss.

-Inline Attachment Follows-
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RE: Sundial At Tower Court, Wellesley College

[Schechner, Sara]

The dial plate is a reproduction of the early 20th century, and the gnomon a 
messed up replacement!

I have been thinking of writing this up with the Team for the NASS Compendium 
as a short article on how to approach a dial found in the field.   Would that 
be of interest to others?

Cheers,
Sara

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Tony Moss
Sent: Sunday, March 31, 2013 2:22 PM
To: sundial@uni-koeln.de
Subject: Sundial At Tower Court, Wellesley College

http://www.dickkoolish.com/rmk_page/pictures_112312.html 

A very fine dial plate but oh what a sad, sad, gnomon.

Tony Moss.
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digital versions of bedos de celles and pini?

[Schechner, Sara]

Dear Dialists,

I am wondering if anyone knows of good quality / high resolution digital 
versions of Valentino Pini, Fabrica de gl'horologi solari (1598) and Bedos de 
Celles, La Gnomonique pratique (1774) or later editions of these.  Each has an 
image I would like to use in an exhibition.

Thanks for the help!
Sara

42°36'N   71° 22'W
West Newton, MA 02465


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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RE: digital versions of bedos de celles and pini?

[Schechner, Sara]

Dear Roger,
Well, it was a lot of digging and we have huge mountains of snow everywhere!  
But not as bad or dramatic as the Blizzard of 1978.

As for the Google Books scan of Bedos de Celles, the scanner never bothered to 
unfold any of the plates.  This is all too often the case with the Google 
books.  Part of the plate I want can be seen here:   
http://books.google.ca/books?id=_BY4MAAJpg=PA431#v=onepageqf=false.

Thanks for checking.  I do appreciate it.
Sara


From: Roger Bailey [mailto:rtbai...@telus.net]
Sent: Monday, February 11, 2013 10:44 PM
To: Schechner, Sara; sundial@uni-koeln.de
Subject: Re: digital versions of bedos de celles and pini?

Hi Sara,

Have you dug out of that meter of snow yet?

I have looked for Bedos de Celles in the past as his tables for the analemma 
were the basis for so many analemma noon marks in France. I have lost my 
original searches but Google books has a fair copy of his text available for 
free. I quickly perused the ebook and found it was text in French and tables 
without diagrams, a challenge for me to read. I just Googled the author and 
title to find this copy. Here is a link
http://books.google.ca/books/about/La_gnomonique_pratique_ou_l_art_de_trace.html?id=_BY4MAAJredir_esc=y

Regards, Roger Bailey

From: Schechner, Saramailto:sche...@fas.harvard.edu
Sent: Monday, February 11, 2013 3:57 PM
To: Sundial List (sundial@uni-koeln.de)mailto:sundial@uni-koeln.de)
Subject: digital versions of bedos de celles and pini?

Dear Dialists,

I am wondering if anyone knows of good quality / high resolution digital 
versions of Valentino Pini, Fabrica de gl'horologi solari (1598) and Bedos de 
Celles, La Gnomonique pratique (1774) or later editions of these.  Each has an 
image I would like to use in an exhibition.

Thanks for the help!
Sara

42°36'N   71° 22'W
West Newton, MA 02465


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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No virus found in this message.
Checked by AVG - www.avg.comhttp://www.avg.com
Version: 2013.0.2897 / Virus Database: 2639/6092 - Release Date: 02/09/13
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Sundials worthy of a tour in England

[Schechner, Sara]

Dear Kevin (and other members of the Sundial List),

I am leading a Harvard Museums of Science and Culture tour to England at the 
end of September 2013 on the theme of Time, in conjunction with an exhibition I 
am curating at Harvard called Time and Time Again:  How Science and Culture 
Shape the Past, Present, and Future.(The exhibition will have more sundials 
than you can shake a stick at, and I'll write more about it in another letter.) 
 The tour will be in London, Greenwich, Oxford, Bath, Lyme Regis, and 
Salisbury, and maybe York.

I am familiar with the museum collections at Oxford, Greenwich, and the British 
Museum, but less so of mass /church sundials, Saxon dials, and other historical 
ones that a coach could stop at en route to somewhere or as part of a tour.   I 
would love to hear your ideas!

Sara
42°36'N   71° 22'W
West Newton, MA 02465





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RE: Sundials worthy of a tour in England

[Schechner, Sara]

Excellent idea!  I'll suggest that we head to Durham!  Thanks!

From: Frank Evans [mailto:frankev...@zooplankton.co.uk]
Sent: Wednesday, January 23, 2013 10:26 AM
To: Schechner, Sara
Subject: Re: Sundials worthy of a tour in England

Dear Sara,
You are following the usual visitor route in England, i.e. only calling at the 
bottom half. There are no Roman dials in England and the two oldest are 
Anglo-Saxon dials in the north. One, the Anglo-Saxon dial at Escomb, County 
Durham, (BSS Register 4752) from around 700, is an absolute gem in a gem of an 
entirely Anglo-Saxon church. In the same county is Durham Cathedral with its 
noon line (BSS Register 0825) for regulating the church clocks. The cathedral 
is another knock-out, claimed to be the finest Romanesque building in the 
world, on a spectacular headland and defended by its own castle.

You should consider this, and there are plenty more dials of interest locally 
including several more Anglo-Saxon ones. Also, of course, this part of the 
world is stuffed with history, the original home of railways, turbines, 
electric light  and Hadrian's Wall, also Georgian town centres and more castles 
than the Rhine, not to mention the odd Broadway success from tiny local 
theatres (Close the Coalhouse Door and The Pitmen Painters, to name a 
couple).
Best,
Frank
55N, 1.5W


On 23/01/2013 13:42, Schechner, Sara wrote:
Dear Kevin (and other members of the Sundial List),

I am leading a Harvard Museums of Science and Culture tour to England at the 
end of September 2013 on the theme of Time, in conjunction with an exhibition I 
am curating at Harvard called Time and Time Again:  How Science and Culture 
Shape the Past, Present, and Future.(The exhibition will have more sundials 
than you can shake a stick at, and I'll write more about it in another letter.) 
 The tour will be in London, Greenwich, Oxford, Bath, Lyme Regis, and 
Salisbury, and maybe York.

I am familiar with the museum collections at Oxford, Greenwich, and the British 
Museum, but less so of mass /church sundials, Saxon dials, and other historical 
ones that a coach could stop at en route to somewhere or as part of a tour.   I 
would love to hear your ideas!

Sara
42°36'N   71° 22'W
West Newton, MA 02465









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Rowlandson sketch?

[Schechner, Sara]

Does anyone know the artist who did the sketch of a foolish servant who digs up 
a sundial in order to answer his gouty master's inquiry about the time?  It 
looks to me like Thomas Rowlandson (1756-1827), but I have been unable to 
identify it or a collection that contains it.  I have put an image in this 
Dropbox: https://www.dropbox.com/s/7skufivsr5vfunh/Dug%20up%20sundial.jpg


Thanks!
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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RE: Rowlandson sketch?

[Schechner, Sara]

Thanks, Douglas and Fred!   The Irish footman is referenced on both websites 
and so I think this must be the same source.   I also like the second painting 
on this theme.

Cheers,
Sara

From: Douglas Vogt [mailto:dbv...@yahoo.com]
Sent: Tuesday, November 27, 2012 7:12 PM
To: Schechner, Sara; Sundial List (sundial@uni-koeln.de)
Subject: Re: Rowlandson sketch?

There are apparently a few drawings on the subject but this description fits, 
especially with reference to the watch. There is no image.
Rowlandson would seem the first choice but his drawings are more detailed.

http://www.royalcollection.org.uk/collection/810682/the-irish-footman
The Irish Footman.

 *   current tab: 
Overviewhttp://www.royalcollection.org.uk/collection/810682/the-irish-footman#accessibletabscontent0-0
 *   Further 
detailshttp://www.royalcollection.org.uk/collection/810682/the-irish-footman#accessibletabscontent0-1

Overview
Creator:
After George Moutard Woodward (1760-1809) (designer)
Creation Date:
published 25 Mar 1808
RCIN
810682
Description:
A footman carries a sundial into the sitting room, where the master is laid up 
with gout. He is furious, as the footman could not set his watch by the 
sundial, but instead dug up the sundial itself !




From: Schechner, Sara 
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
To: Sundial List (sundial@uni-koeln.demailto:sundial@uni-koeln.de) 
sundial@uni-koeln.demailto:sundial@uni-koeln.de
Sent: Tuesday, November 27, 2012 4:35 PM
Subject: Rowlandson sketch?

Does anyone know the artist who did the sketch of a foolish servant who digs up 
a sundial in order to answer his gouty master’s inquiry about the time?  It 
looks to me like Thomas Rowlandson (1756-1827), but I have been unable to 
identify it or a collection that contains it.  I have put an image in this 
Dropbox: https://www.dropbox.com/s/7skufivsr5vfunh/Dug%20up%20sundial.jpg


Thanks!
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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RE: Wrist worn competition for sundials

[Schechner, Sara]

The transition already happened between stationary dials and clocks and 
portable watches---these were the numerous portable dials designed to be 
carried in a pocket or worn on a chain or ribbon.  Some were even finger rings.

Sara Schechner

42°36'N   71° 22'W
West Newton, MA 02465



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Art Krenzel
Sent: Monday, November 19, 2012 11:57 AM
To: sundial@uni-koeln.de
Subject: Wrist worn competition for sundials

Might this become a transition design between stationary sundials and clocks?  
A mobile app perhaps?

http://m.gizmag.com/article/25064/?utm_source=Gizmag+Subscribersutm_campaign=931b2213ab-UA-2235360-4utm_medium=email

Art Krenzel

45.828N  122.565W







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Second Call for Papers: SIC in Manchester, 2013

[Schechner, Sara]

SECOND CALL FOR PAPERS
Scientific Instrument Commission Sessions
International Congress of History of Science, Technology, and Medicine
Manchester, England
July 22-28, 2013

TO SUBMIT A PAPER, please use this special portal for SIC papers: 
http://ichstm2013.com/abstractsubmission/?sic

The DEADLINE for submissions is Friday 30 November 2012.

THEMES suggested by the SIC Board:

Trade and transfer of instruments.  This is could be between individuals, 
manufacturers, retailers, institutions, countries, Europe and the Americas, or 
other pairings.   We encourage people who could not travel to Rio de Janeiro to 
speak on this topic in Manchester.

Time.  Acceptable papers can be about any kind of scientific instrument related 
to time measuring, time finding, time recording, time and work, time and music, 
time and psychology, time and navigation, time in sports, or any other topic 
involving time-associated instruments.

Other topics are also welcome as long as they concern the history of scientific 
instruments, preservation, conservation, or documentation of collections of 
instruments, or their use within the wider disciplines related to scientific 
heritage and the history of science.

The SIC especially welcomes papers from students and young scholars and hopes 
to be able to offer a few modest travel grants to such to attend the 2013 
meeting and deliver a paper.

Sincerely,

Sara Schechner
SIC Secretary
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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Re: new app Sol Et Umbra for Android

[Schechner, Sara]

This is great!  I am in Rio de janeiro and just downloaded it.

Enjoying seeing the sun in the northern sky and sundials here.

Sara
-22.9 lat -43.2 long

Sent from my iPhone

On Oct 10, 2012, at 12:09 PM, rPauli 
rpa...@speakeasy.orgmailto:rpa...@speakeasy.org wrote:

Here it is:

http://www.sunsurveyor.com/2012/09/14/sun-surveyor-now-available-for-iphone-and-ipad/


On 10/10/2012 1:02 AM, Kevin Karney wrote:
Very jealous!Can someone translate the code to iPhone.
Please!
Kevin

Kevin Karney
Freedom Cottage, Llandogo, Monmouth, NP25 4TP
Phone 01594 539 595. Mobile 07595 024 960

On 9 Oct 2012, at 22:59, Simon [illustratingshadows 
illustratingshad...@yahoo.commailto:illustratingshad...@yahoo.com wrote:

very nice app, beat me to it! :)

Simon

Simon Wheaton-Smith
www.illustratingshadows.comhttp://www.illustratingshadows.com
Phoenix, Arizona, W112.1 N33.5
From: sun.di...@libero.itmailto:sun.di...@libero.it 
sun.di...@libero.itmailto:sun.di...@libero.it
To: Sundial list Sundial list 
sundial@uni-koeln.demailto:sundial@uni-koeln.de
Sent: Tuesday, October 9, 2012 1:49 PM
Subject: new app Sol Et Umbra for Android

If you own an Android device (smartphone or tablet) you may want to take
advantage of the new app Sol Et Umbra that means Sun and Shadow.
It is available for free from the usual Google app market.

Sol Et Umbra is basically an app that shows sun ephemeris for the actual (or
whichever desired) time and date:
- latitude and longitude
- right ascension and declination
- local azimuth and height
- equation of time
- local or time zone sun time
- local or time zone mean time
- time of rise, set and transit (local noon)
- total number of hours of light

Moreover Sol Et Umbra shows the time using italic, babilonic and temporal time
systems.
It also shows the time of Muslims prayers (that are strictly related to the
position of the sun): Fajr, Zuhr, Asr1, Asr2, Maghrib and Isha.

Sol Et Umbra can use the orientation sensors available in the device in order
to compute and show the time lines of a sundial designed on the plane of the
display.
The graph is updated after any movement of the device.

Finally the app can show the lighting conditions of a dial that is drawn on
the device plane by means of an azimut / height graph that shows for any day in
the year and for any hour in the day when the dial is lighted.

More information on the program are available from my site: http://digilander.
libero.it/orologi.solari/download/SolEtUmbraENU.htmlhttp://libero.it/orologi.solari/download/SolEtUmbraENU.html

Ciao.
Gian
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Call for Papers: SIC Symposium 2013--Manchester

[Schechner, Sara]

MEETING ANNOUNCEMENT 
CALL FOR PAPERS

Next year the Scientific Instrument Commission will hold its annual Symposium 
in Manchester as part of the 24th International Congress of History of Science, 
Technology, and Medicine (http://ichstm2013.com/).  The full Congress runs from 
Monday July 22 to Sunday July 28, 2013.   We do not yet know when the SIC 
sessions will be during the week, but we do know that they will be sequential 
on adjacent days and not scattered over the course of the Congress.

The organizers have set aside three full days for SIC talks.

* Each day will have four 90-minute sessions of four papers each.

* The SIC sessions will be plenary and not parallel to each other.

* The standard paper length will be 15 minutes + 5 for discussion.

* The total number of papers possible is 48.

* All papers must be oral.  We do not have space for poster papers.

Papers on all instrument topics are welcome and may concern the history of 
scientific instruments, preservation, conservation, or documentation of 
collections of instruments, or their use within the wider disciplines related 
to scientific heritage and the history of science.  You may of course take 
direction from the Congress theme, Knowledge at work, but it is not required.

As usual the SIC meeting committee will organize independently contributed 
papers into thematic sessions.

We hope to have one session that recognizes the work of the late Gerard L'E. 
Turner.

If you would like to organize your own cluster of papers on a particular theme, 
please have each speaker submit his or her abstract separately and let the SIC 
Secretary know of your intentions.

TO SUBMIT A PAPER, please use this special portal for SIC papers: 
http://ichstm2013.com/abstractsubmission/?sic

The DEADLINE for submissions is Friday 30 November 2012.

The SIC especially welcomes papers from students and young scholars and hopes 
to be able to offer a few modest travel grants to such to attend the 2013 
meeting and deliver a paper.

In addition to the talks, we are planning to arrange visits to instrument 
collections and related sites.  If you have ideas to suggest or can help us 
make arrangements, please contact the SIC Secretary.

Sincerely,

Sara Schechner
SIC Secretary
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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makers Tanget and D. Praetorius

[Schechner, Sara]

I am cataloguing two inclining sundials and would be grateful for more 
information about the makers:

The first is  in the English style but signed in Cyrillic.  I recall seeing 
lots of this sort of sundial in St. Petersburg, and some were made by English 
makers who had relocated to Russia to serve the court or admiralty.   The 
maker's name is ТАНГЕТЪ.

I have uploaded some images of the sundial to this website:
https://www.dropbox.com/sh/05mhayi695l14lq/MOKGkWZSIU

The second is signed D. Praetorius.He is not the  Johann Praetorius 
listed in Zinner.   The sundial may be 18th century.  Images of it are here:
https://www.dropbox.com/sh/k3tnpcq50z8e1sa/HD51q4GRg9

Any help you can give me would be very happily received.
Best wishes,
Sara
42°36'N   71° 22'W
West Newton, MA 02465


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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Johann Engelbrecht

[Schechner, Sara]

Does anyone have a copy of the following article or booklet?

Fischer, Karl Adolf Franz. 1963. Die Sonnenuhrmacher Engelbrecht in Beraun ; 
and Eine Sonnenuhr von Johann Engelbrecht.
NUZ. Neue Uhrmacher-Zeitung Alte Uhren. 14-17.

If so, could you scan it for me?  Thanks!
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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SCIENTIFIC INSTRUMENTS COMISSION SYMPOSIUM - OCTOBER 2012 - RIO DE JANEIRO

[Schechner, Sara]

Ever wonder how sundials work south of the Equator?  Join us in Rio and find 
out!  Attached is a conference announcement and second call for papers.
Sara Schechner, SIC Secretary

Dear Colleagues,

The Museum of Astronomy and Related Sciences of the Ministry of Science, 
Technology and Innovation is glad to host the 31st edition of the Symposium of 
the Scientific Instrument Commission.  The conference is open to all interested 
in the history, preservation, documentation and use of scientific instruments.

The Conference will take place between 8 and 12 October 2012 and will include 
visits to the most important collections of scientific instruments in Rio de 
Janeiro. FOR MORE INFORMATION, please visit the site of the Symposium at the 
address http://www.mast.br/sic_2012/index.html

We invite all to participate in the 31st Symposium and contribute to the 
discussions. Please see the Call for Papers below and submit an abstract before 
the indicated deadline.

Call for Papers

The aims of the XXXI Symposium correspond with SIC's mission: to encourage 
scholarly research on the history of scientific instruments, preservation, 
conservation and documentation of collections of instruments, as well as their 
use within the wider disciplines related to scientific heritage, museology and 
the history of science.

Papers submitted to the XXXI Symposium of the Scientific Instrument Commission 
(IUHPS/DHST) should address issues and challenges pertaining to research, 
interpretation, and promotion of scientific instruments, with emphasis on:

Use, trade, and transfer of scientific instruments between Europe and the 
Americas

The trade of instruments and methods using them was bilateral, with apparatus 
moving not only from Europe to the Americas, but also from the Americas to 
Europe. For its next Symposium in Rio de Janeiro SIC especially invites 
researchers to contribute on this theme.

As in every SIC symposium, papers on other instrument topics are also welcome, 
as long as they relate to the history of scientific instruments, preservation, 
conservation, or documentation of collections of instruments, or their use 
within the wider disciplines related to scientific heritage, museology, and the 
history of science.
Deadlines

Submission of Abstracts: June 01, 2012
Early Registration: until July 15, 2012
Regular Registration: until August 30, 2012
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medieval astronomy (was: Georg of Peuerbach)

[Schechner, Sara]

Dear Roger,
I have not been following this thread on Peuerbach closely, but feel it 
necessary to challenge two statements:


1) the description of Medieval astronomy and science as impoverished and 
dark.  While this was a popular view until the mid-twentieth century, this is a 
fallacy and been disproved in many books and essays. I can't begin to list all 
the literature to the contrary, but here are some starting points:



Medieval science, technology, and medicine : an encyclopedia /  Thomas F. 
Glick, Steven J. Livesey, Faith Wallis, Editors.


A source book in medieval science / Grant, Edward, editor.

Science in the Middle Ages / David C. Lindberg, editor

Other authors who have written much on medieval astronomy and science include 
Bernard Goldstein, E. S. Kennedy,  David King, Bruce Eastwood, Stephen 
McCluskey, Emmanuel Poulle, and more..

As for rudimentary fumbling in Western Europe in the Middle Ages, please 
remember that one of the most sophisticated instruments for finding time by the 
sun is the planispheric astrolabe-truly the queen of medieval instruments.



2) the introduction of the polar gnomon...gave us sundials that were 
independent of the seasons and could be viewed from a distance, public 
instruments rather than private tools for timekeepers and astronomers.  This 
is also not true.  Public sundials go back to the ancient Greeks, who set them 
up in market places and public baths.  By the third century BC there were so 
many of them that people complain about having to run their lives by these 
blasted timepieces.  Many could be read at a distance.  Take for example the 
Tower of Winds in Athens.

Best wishes,
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of JOHN DAVIS
Sent: Wednesday, February 15, 2012 5:11 AM
To: Sundial List; Roger Bailey
Subject: Re: Georg of Peuerbach

Dear Roger et al,

I don't think the later middle ages were quite as dark in Europe as you 
suggest. Science did make some progress (eg the 'Merton calculators') despite 
the disruptions of the various plagues.

For example, the monk Robert Stikford, working at St Alban's Abbey (not far 
from Oxford University) between 1367 and 1401, devised accurate methods of 
drawing vertical dials for equal hours. These included walls in declining 
directions. However, he used a nodus point rather than a polar-aligned gnomon: 
looking at his drawings, he was tantalizingly close. [For a preliminary 
description, see my article in the December 2011 BSS Bulletin.] He was 
calculating altitudes and azimuths to arc-minutes.

According to Ernst Zinner, the first person in Europe to write about polar 
gnomons (in an equinoctial dial) was Nicholas de Heybech (various spellings) in 
1431. I have so far been unable to trace the relevant MS. But it wasn't a new 
discovery, so we have a narrow range of time when it was either (re)invented in 
Europe or introduced from the Islamic world.

Re the two dials on Braunschweig Cathedral: the dating of these is extremely 
problemmatical and I don't believe Zinner's dates - even he changed his mind!

There is still much to learn of early dialling! Peuerbach did much good work 
but he wasn't the first.

John
--

Dr J Davis
Flowton Dials

--- On Wed, 15/2/12, Roger Bailey 
rtbai...@telus.netmailto:rtbai...@telus.net wrote:

From: Roger Bailey rtbai...@telus.netmailto:rtbai...@telus.net
Subject: Georg of Peuerbach
To: Sundial List sundial@uni-koeln.demailto:sundial@uni-koeln.de
Date: Wednesday, 15 February, 2012, 5:43
I have been looking at the renaissance, the coming of age of science in general 
and sundial science in particular in Europe. The dark ages were just that, 
winter, a survival regime for intellectual thought and physical existence. With 
the renaissance things changed, like blossoms in the spring or the coming of 
age of people.  I tend to view the world through a specific window, the prism 
of sundials. This gives a distorted but colorful view that avoids much of the 
noise in the general historical review and provides a unique perspective. 
Everything I need to know was learned through sundials

Here my specific interest is the introduction of the polar gnomon. This 
innovation gave us sundials that were independent of the seasons and could be 
viewed from a distance, public instruments rather than private tools for 
timekeepers and astronomers. On a planar sundial with a polar gnomon,  the 
shadows did not race off on tangents. Hour lines were constrained and visible 
on a dial face.  In the Moslem world, by the 14th century, there was an a 

RE: Equinoctial vs. Equatorial

[Schechner, Sara]

I classify sundials into three principal categories-those that find time from 
the sun's hour angle; those that use the sun's azimuth; and those that use the 
sun's altitude-plus various combinations of two out of the three.   In the 
first category, we generally subdivide dials according to the plane on which 
the shadow is projected-i.e., horizontal, vertical, equatorial, polar,  etc.

Sundials that project the sun's hour angle onto a plane parallel to the equator 
are equatorial dials.  These include many forms such as the universal 
equatorial dial, the Augsburg-type dial, those with an armillary or crossed-Cs 
form, mechanical equatorial dials, and more.  The convention in the US is to 
call all of these  equatorial dials.

In the United Kingdom, it is a convention to call them equinoctial dials.   
This is perhaps because the celestial equator is often called the equinoctial 
circle in the UK and the equinoctial circle/celestial equator are in the same 
plane as the terrestrial equator

I prefer the label equatorial because it is a typology  constructed in 
parallel to the others (horizontal, vertical, polar) which refer to an 
orientation on the earth and don't mix in celestial  designations.

Cheers,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html


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RE: Sundial reference in Super Bowl commercial

[Schechner, Sara]

I recognized the king as Elton John; the singer, Melanie Amaro, I'm told is a 
winner of X-Factor, a reality singing show.  But I also do not know who the 
dial-chested fellow was. Pray tell.

So much for my grasp of modern pop culture!  Ask me about sundials and pop 
culture a few centuries ago

Sara

From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Richard Mallett
Sent: Monday, February 06, 2012 1:13 PM
To: J. Tallman
Cc: Sundial Mailing List
Subject: Re: Sundial reference in Super Bowl commercial

On 06/02/2012 17:13, J. Tallman wrote:
Hello All,

I'm not sure how many of you watched the Super Bowl yesterday, but I thought 
I'd write to tell you that there was a sundial reference in one of the ads - 
did you see it?

For those of you who don't know, the Super Bowl is a big American cultural 
event built around a championship football game (not soccer) and for many, the 
commercials are the biggest reason to watch. Since hundreds of millions of 
viewers watch the game every year, the commercials can cost up to 3-4 million 
dollars for a 30 second ad spot and are frequently talked about the next day, 
even more than the game itself!

So here is the commercial with the sundial reference...and for those of you 
who are familiar with enough American pop culture to recognize the character 
with the dial you might get a chuckle. The rest of you who don't get the 
inside joke will probably be left scratching your head...but the ad is fun and 
I am sure most of you will at least recognize the king:

http://www.youtube.com/watch?v=Rcf01QTcO6Efeature=player_embedded


Best,

Jim Tallman
www.artisanindustrials.comhttp://www.artisanindustrials.com/
jtall...@artisanindustrials.commailto:jtall...@artisanindustrials.com





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The character at the end wasn't on long enough for me to recognise him.  I 
guess the king was Reg Dwight from Pinner, judging by the glasses.  Don't know 
the girl - not Aretha Franklin, who recorded 'Respect' in my young day.



--

--

Richard Mallett

Eaton Bray, Dunstable

South Beds. UK
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RE: Sundial reference in Super Bowl commercial

[Schechner, Sara]

Oh, now that I have checked for images of Flavor Flav, I see his propensity to 
wear large clocks and that crazy horned helmet.  It is pretty funny.  --S

From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Maureen Salmi
Sent: Monday, February 06, 2012 2:31 PM
To: Tony Moss
Cc: sundial@uni-koeln.de
Subject: Re: Sundial reference in Super Bowl commercial

Good morning,

Nice screenshot!  This is rapper Flavor Flav, who was famous for wearing huge 
clocks around his neck in the 80's and 90's.  You can see photos on his 
Wikipedia page. This is a pretty funny gag.

My daughter identified Flavor Flav; I had no idea.

Maureen
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RE: 2 questions: declination animation

[Schechner, Sara]

Hi Darek,
IF you have a straight-on photograph, you can measure the angles between the 
hour lines and the 12 o'clock line.  You can then reverse engineer the dial to 
figure out the latitude and declination.  You will probably find some scatter 
of values, but this is normal.  If the gnomon is present, you can measure that 
too.

Sara

-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Darek Oczki
Sent: Tuesday, January 10, 2012 6:32 PM
To: sundial@uni-koeln.de
Subject: 2 questions: declination  animation

Dear Diallists

I've got two practical questions:

1. Let's say I have a photograph of a sundial. I do not know where it was 
originally located. Is there a way to discover the values of the declination 
and latitude it was designed for? There are clear hour and declination lines on 
the dial.

2. A friend of mine is helping a student in an attampt to reconstruct an old 
missing dial. They need a software which allows to make an animation of a 
shadow's path over the dial. Is there anything that would help them?

I would be most grateful for any suggestions.

-- 
Best regards
Darek Oczki
52N 21E
Warsaw, Poland

GNOMONIKA.pl
Sundials in Poland
http://gnomonika.pl
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RE: Sundials in cinema

[Schechner, Sara]

Dear Darek,
The Sundial Pictures animation is quite dramatic.   Wow!But the Melancholia 
screen shot is weirdly (or purposefully) constructed so that each shrub has 
TWO shadows at the same moment!  

Sara
42°36'N   71° 22'W 
West Newton, MA 02465

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RE: Sara Schechner

[Schechner, Sara]

The article mentioned is:
Sara Schechner, The material culture of astronomy in daily life:  Sundials, 
science, and social change,  Journal for the History of Astronomy 32 (2001): 
189-222.

It can be found online here:  http://adsabs.harvard.edu/full/2001JHA32..189S
And here:  http://www.antique-horology.org/_Editorial/schechner.pdf

More information along the lines of this essay will be included in the 
forthcoming catalogue of sundials and timefinding instruments at the Adler 
Planetarium and Astronomy Museum in Chicago, which I am writing.   (After that 
is complete, I have plans to write a book, _Sundials, Science, and Social 
Change_.)

Sara

42°21'N, 71°13'W

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html





From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Donald Christensen
Sent: Monday, August 15, 2011 8:25 PM
To: Willy Leenders
Cc: sundial@uni-koeln.de
Subject: Re: Sara Schechner

Karon

Where do I find Saras article?
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Re: Time at Sea

[Schechner, Sara]

Time at sea was found astronomically by using a quadrant, nocturnal, or sundial 
such as a universal ring dial.

Sara
P.S. Thanks for your praise of my article.

Sent from my iPhone

On Aug 15, 2011, at 9:23 AM, karon 
ka...@karonadams.commailto:ka...@karonadams.com wrote:

For a lot of years, time was measured on board ship with a series of sand 
timers. I hesitate to call them hourglasses because they were calibrated to so 
many different segments of time.  Theoretically, one CAN use a sundial on board 
a ship. Navigation allows you to determine where you are NOW and check a 
moveable sundial.

But, for the ordinary sailor, their lives were ordered by the ship’s bells 
which were often determined by sand timers. What other kinds of timing devices 
does anyone know of used at sea before the era of modern clocks?

Karon Adams
Accredited Jewelry Professional (GIA)
You can send a free Rosary to a soldier!
www.facebook.com/MilitaryRosaryhttp://www.facebook.com/MilitaryRosary
www.YellowRibbonRosaries.comhttp://www.YellowRibbonRosaries.com

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RE: Passion

[Schechner, Sara]

It is a merkhet and I have used one.  It is for use at night with stars 
crossing rhe meridian.

Sara 


From: sundial-boun...@uni-koeln.de [sundial-boun...@uni-koeln.de] On Behalf Of 
Brent [bren...@verizon.net]
Sent: Saturday, July 30, 2011 5:30 PM
To: sundial@uni-koeln.de
Subject: Re: Passion

Here is a sundial that works at night that was found in
King Tuts tomb.

http://serostar.com/cosmic/gallery.php#11715

This looks like a very interesting device.
Has anyone ever used one?

Anyone know how to use one?

thanks;
brent


On 7/29/2011 9:42 PM, Brent wrote:
 Hello again;

 I have noticed some of you are very passionate about sundials.

 I’m curious how far that passion goes.

 Do any of you plan to have a sundial on your gravestone?

 Do any of you plan to be buried with a sundial?

 Do any of you have a sundial tattoo?



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FW: source of NAWCC old timer logo

[Schechner, Sara]

Tony,

You were wondering about the source of the print of an Victorian gentleman 
checking his pocket watch against a sundial in a garden.   The image is from 
the title page of



* Title: Time and Time-Tellers

* Author: James W. Benson

* Publisher: Robert Hardwicke

Keywords: time anthology historic

Notes: Historic book introducing horology to the educated layman through 
specific examples, illustrated

Edition: 1875 -- Copyright: 1875

Kind: Book

Pages: 189 -- Height in cm: 19

Print Status: out of print



You can see it here on Google Books:

http://books.google.com/books?id=UygJIAAJpg=PR7#v=twopageqf=false



The image was formerly used as the logo for the National Association of Watch 
and Clock Collectors, frequently with the motto, Tempus vitam regit.  Some 
affectionately refer to it as the old timer.



Best wishes,

Sara



Sara J. Schechner, Ph.D.

David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments

Department of the History of Science, Harvard University

Science Center 251c, 1 Oxford Street, Cambridge, MA 02138

Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu

http://www.fas.harvard.edu/~hsdept/chsi.html






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RE: Old sundial pictures

[Schechner, Sara]

Did I miss part of this thread?  I am curious to see the images referred to.  
Are they posted on a website?

Sara

42°21'N   71° 14'W 


-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Donald Christensen
Sent: Wednesday, June 29, 2011 6:24 PM
To: Kevin Karney
Cc: Sundials List
Subject: Re: Old sundial pictures

Kevin

I really like the St Petersburg one! the other black and white g792092
is another great one.

Thank you.

Does anyone have any older ones? A scanned image from a book will do.

dchristensen...@gmail.com

On 6/30/11, Kevin Karney kar...@me.com wrote:
 Hi Donald
 Any of these of any use?
 I personally love the Victorian lady picture (a memento mori - see what the
 gardner is carrying)
 and the one from St Petersburg palace with the communist apparatjik, showing
 the secret service man, the poor peasant and the school teacher how the dial
 works
 Where are you based ? I also lecture on the history of Sundials...


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RE: Sundials in museums (world-wide)

[Schechner, Sara]

I am currently completing a catalogue of the sundials at the Adler Planetarium 
in Chicago, having at an earlier stage in my career been the chief curator of 
the instrument collection there.  I am now the curator of Harvard's Collection 
of Historical Scientific Instruments, which has what we think is the largest 
collection of sundials in North America.  I am also cataloguing this 
collection.  Another large sundial collection with close to 400 items is that 
of the National Maritime Museum in Greenwich, England.

But before one considers numbers, we must decide what counts as a sundial.  Are 
we including other time finding instruments in these collections such as 
astronomical compendia, horary quadrants, de Rojas astrolabes and other 
astrolabic instruments (on their own or built into compendia)--all of which use 
the sun to find time?  What about nocturnals (which use the stars, but are 
often considered part of sundial collections)?  What about clocks with sundials 
built into them for setting the timekeeper?

If you tell me what's in and what's out, I'll give you numbers I know at this 
time.  But please be aware that these collections are still growing.

Sara


Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Dariusz Oczki
Sent: Thursday, June 02, 2011 6:33 AM
To: sundial@uni-koeln.de
Subject: Sundials in museums (world-wide)

Dear Diallists

I am sure many of you have heard about a sundial collection in Jędrzejów 
(Jedrzejow), Poland which can be seen in the Przypkowski Museum. There is one 
information repeated for many years about the collection which I would like to 
confirm or update. It says the Jędrzejów sundial collection is the third 
biggest in the world after those in Chicago and Oxford. Now, I've got two 
questions:

1. Could anyone provide the numbers of sundial they have (ie. museums in 
Chicago and Oxford)?
2. Are there any other big sundial collections exceeding 400 pieces?

In the late 70. this info could be true but as the Jędrzejów collection is no 
longer expanding the situatian could dramaticaly change. All I need is to find 
out the present score and if necessery update the info in our local media. I 
would be very gratefull for the exact numbers. A curator from the Przypkowski 
Museum already gave me the real number of sundials in Jędrzejów (457 amongst 
677 all kinds of astronomical instruments).

-- 
Best regards
Darek Oczki
52N 21E
Warsaw, Poland

GNOMONIKA.pl
Sundials in Poland
http://gnomonika.pl
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D. B. Sheahan sundials on campus

[Schechner, Sara]

I am doing some research on D. B. Sheahan, an Irish-born sculptor who lived and 
worked in New York City in the second half of the 19th century.   His best 
known sculpture is a bronze bust of Thomas More in New York's Central Park.
According to some sources, Sheahan made some monumental and wall sundials for 
college campuses on the eastern seaboard of the United States.  I have looked 
in the Sundial Registry of NASS, but do not find any sundials of this sort 
attributed to him.  The only dials known to me are the portable dials he made 
for friends, which are now in the Adler Planetarium's collection (which I am 
cataloguing).

Does anyone know of any fixed sundials made by Sheahan?  I would be grateful to 
learn of them on or off the list.

Thanks!
Sara

42°21'N, 71°13'W

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html





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RE: Where are the women?

[Schechner, Sara]

Hey, hey, I just wrote in to the list a day ago.  :)But I'll grant you that 
some of us are rather quiet online because we are too busy with other 
things-like cataloguing sundials in museums.

Sara (a woman last I checked)

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Marcelo
Sent: Thursday, March 10, 2011 6:13 PM
To: Sundial List
Subject: Where are the women?

I've just noticed that, as long as I remember, there is no female participation 
in this mailing list. As I study in the Astronomical and Geophysical Institute 
at the University of Sao Paulo, where we lack not of the gracious presence of 
women - there are more men here, but women are expressive too - I strange their 
absence from our astronomical inquiries and conversations. Maybe there is some 
truth in that old cliché of men being more prone to math and abstration than 
them?
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RE: A 14th century sundial question from France.

[Schechner, Sara]

I had exactly the same thought as John-that this was a table of shadow lengths 
in the form that Bede gives in the 7th century.
Sara


Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of JOHN DAVIS
Sent: Wednesday, March 09, 2011 5:13 AM
To: Sundial Mailing List; Bill Gottesman
Subject: Re: A 14th century sundial question from France.

Hi Bill (and other dialling colleagues),

The data that you show looks very similar to the Venerable Bede's shadow length 
tables (though the values are slightly different). This gives the length of a 
person's shadow on the assumption that their height is equal to six of their 
own feet (tall people generally have big feet!). But the hours are probably not 
the modern equal ones.

This topic will be discussed in some detail in the forthcoming June issue of 
the BSS Bulletin. A reason for the inaccuracies will be proposed, together with 
a rather more accurate version of the same table, to be found in an Anglo-Saxon 
manuscript.

Regards,

John
-

Dr J Davis
Flowton Dials

--- On Wed, 9/3/11, Bill Gottesman 
billgottes...@comcast.netmailto:billgottes...@comcast.net wrote:

From: Bill Gottesman 
billgottes...@comcast.netmailto:billgottes...@comcast.net
Subject: A 14th century sundial question from France.
To: Sundial Mailing List 
sund...@rrz.uni-koeln.demailto:sund...@rrz.uni-koeln.de
Date: Wednesday, 9 March, 2011, 1:06
Richard Kremer, the Dartmouth physics professor who brought the ~1773 Dartmouth 
Sundial to display at the NASS convention this past summer, asked me the 
following question.  I have done a bit of modelling on it, and have not been 
able to supply a satisfactory answer.  Is anyone interested in offering any 
insight?  My hunch is that the astronomer who wrote this guessed at many of 
these numbers, and that they will be estimates at best for whatever model they 
are based on.  I have tried to fit them to antique, equal, and Babylonian 
hours, without success.  In 1320, the equinoxes occured around March and Sept 
14 by the Julian Calendar, as best I can tell, and that doesn't seem to help 
any.

-Bill
---
I've got a sundial geometry question for you and presume that either you, or 
someone you know, can sort it out for me.

A colleague has found a table of shadow lengths in a medieval astronomical 
table (about 1320 in Paris).  The table gives six sets of lengths, for 2-month 
intervals, and clearly refers to some kind of gnomon that is casting the 
shadows.  The manuscript containing this table of shadow lengths appears in a 
manuscript written by Paris around 1320 by John of Murs, a leading Parisian 
astronomer.  I don't know whether Murs himself composed the table or whether he 
found it in some other source.  The question is, what kind of dial is this.  A 
simple vertical gnomon on a horizontal dial does not fit the data, which I give 
below.

Dec-Jan
hour 1 27 feet
hour 2 17 feet
hour 3 13 feet
hour 4 10 feet
hour 5 8 feet
hour 6 [i.e., noon] 7 feet

Nov-Feb
1 26
2 16
3 12
4 9
5 7
6 6

Oct-Mar
1 25
2 15
3 11
4 8
5 6
6 5

Sept-Apr
1 24
2 14
3 10
4 7
5 5
6 4

Aug-May
1 23
2 13
3 9
4 6
5 4
6 3

Jul-Jun
1 22
2 12
3 8
4 5
5 3
6 2

Note that in each set, the shadow lengths decrease in identical intervals (-10, 
-4, -3, -2, -1).  This might suggest that the table is generated by some rule 
of thumb and not by exact geometrical calculation, for by first principles I 
would not expect these same decreasing intervals to be found in all six sets!

I started playing with the noon shadow lengths at the solstices, looking for a 
gnomon arrangement that yields equal lengths of the gnomon for shadow lengths 
of 7 (Dec) and 2 (Jun) units.  If you assume the dial is horizontal and you 
tilt the gnomon toward the north by 55 degs, my math shows that you get a 
gnomon length of 2.16 units.  I assume that Paris latitude is 49 degs and the 
obliquity of the ecliptic is 23.5 degs (commonly used in middle ages).

I'm too lazy to figure out the shadow lengths for the other hours of the day 
with a slanted gnomon, and presume that you have software that can easily do 
that.  Would you be willing to play around a bit with the above lengths and see 
if you can determine what gnomon arrangement might yield these data?  Perhaps 
the dial is vertical rather than horizontal?  In any case, the data are 
symmetrical, so the gnomon must be in the plane of the meridian.

Knowing that you like puzzles, I thought I'd pass this one on to you.  If you 
don't have time for it, don't worry.  This is not the most important problem 
currently 

SUNDIAL life before AND WITH clocks

[Schechner, Sara]

I am addressing many of these questions in an interpretive catalogue of several 
hundred sundials and timefinding instruments at the Adler Planetarium and 
Astronomy Museum in Chicago (to be published in two volumes), and in a separate 
book, Sundials, Science, and Social Change (appearing later).



A summary of the main points can be found in this article:

The Material Culture of Astronomy in Daily Life:  Sundials, Science, and 
Social Change,  Journal for the History of Astronomy 32 (2001): 189-222.



I find that someone has scanned and posted it here:

http://www.antique-horology.org/_Editorial/schechner.pdf



Cheers,
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   
sche...@fas.harvard.edumailto:sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html





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RE: Beer sundial

[Schechner, Sara]

Dear Claude,
I also collect sundials used in advertisements and have a number used in beer 
and whisky ads.  Is the attached gif the San Miguel ad you mention or is it the 
placemat you created?  The image was too pixilated to tellbut it's great.

Sara


Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of Claude Hartman
Sent: Friday, September 24, 2010 1:47 PM
To: sundial@uni-koeln.de
Subject: Beer sundial

  I have an interest in sundials used in Beer advertisement.  I made a 
place-mat for an advertiser in 2000 for a limited circulation.  (see below)

In trying to find more about the San Miguel ad I found an amusing Alan Wake 
sundial at http://adsoftheworld.com/media/outdoor/xbox_alan_wake_sun_dial

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email address wanted

[Schechner, Sara]

I would like to contact Klaus Eichholz by email.  If he is a reader of this 
list, or if anyone has his current email address, please contact me off-list.
Thank you.
Sara

Sara J. Schechner, Ph.D.
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html

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RE: Russell Porter Sundial?

[Schechner, Sara]

Nicola,
Great explanation of terminology.  I completely agree and applaud your use of 
the historical literature for guidance.  

All best,
Sara

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



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RE: Russell Porter Sundial?

[Schechner, Sara]

I have never seen this form associated with Russell Porter, but will check 
further.However, I think we need more information to tell the conventional 
type.  For example, is the long rod the gnomon, and is it to scale with the 
arc?  What do the hour lines look like?  Does the sundial include both wooden 
objects set up as a pair, or just a single one?

Sara

Sara J. Schechner, Ph.D. 
David P. Wheatland Curator of the Collection of Historical Scientific 
Instruments
Department of the History of Science, Harvard University
Science Center 251c, 1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542   |   Fax: 617-496-5932   |   sche...@fas.harvard.edu
http://www.fas.harvard.edu/~hsdept/chsi.html



-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On 
Behalf Of 
Sent: Thursday, May 20, 2010 2:45 PM
To: sundial@uni-koeln.de
Subject: Russell Porter Sundial?

Friends,

Is there a conventional name (like  horizontal',  equatorial',  polar' and so 
on) for the sundial constructed as shown below? 

Am I right thinking that the name of this construction is Russell sundial? 
I mean Prof. Russell Porter, the Palomar Mountain Observatory. 

Any help, please.

Aleks
www.sundials.ru


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