Re: a unique sundial on a cylindrical column of opal glass

[rodwall1234]

Hi Willy,


That’s a great idea, thanks for showing us. Maybe someone will include it in 
their Sundial Software?


Roderick Wall.



From: Willy Leenders
Sent: ‎Monday‎, ‎October‎ ‎14‎, ‎2013 ‎5‎:‎36‎ ‎AM
To: Sundial sundiallist


Dear sundialists,

I calculated a unique sundial on a cylindrical column of opal glass.




It is inaugurated in the vicinity of Brussels (Belgium).

The shadow of the sphere falls on the inside of the cylinder and can be seen 
through the opalescent glass on the outside. There the shadow gives an 
indication of the time and the date.

You can see more information specially translated for you in English on my 
website on page http://www.wijzerweb.be/humbeek001AENGLISH.html










Willy Leenders

Hasselt in Flanders (Belgium)




Visit my website about the sundials in the province of Limburg (Flanders) with 
a section 'worth knowing about sundials' (mostly in Dutch): 
http://www.wijzerweb.beinline: humbeek001A.jpg---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: a unique sundial on a cylindrical column of opal glass

[rodwall1234]

Hi Larry,


That's interesting in that you did a Sundial Patent. I’ve often wonder if it is 
worth it to Patent things as the cost could be high. I hope you don’t mind me 
asking, did you make any money and did it make you rich?


I’ve downloaded your paten into my “Make Sundial” folder. Has the Patent 
expired? Are we now allowed to build it?


Thanks, regards,


Roderick Wall.



From: Larry Bohlayer
Sent: ‎Tuesday‎, ‎October‎ ‎15‎, ‎2013 ‎12‎:‎39‎ ‎AM
To: sundial@uni-koeln.de



I patented a version of this type of sundial in the early 1980s and made a 
number of them (of smaller scale) in brass and glass. I coined the name 
“SunVial” to describe our product.

 

More at: 
https://www.google.com/patents/US4384408?pg=PA1dq=bohlayerhl=ensa=Xei=iPJbUr_TJKigyAHWpIGwBQved=0CEoQ6AEwAw


 

Larry

 

Larry Bohlayer

Celestial Products

608 Coral Bells Ct NW

Concord, NC 28027-8034

540-338-4040

Fax 704-973-7799

la...@celestialproducts.com

www.celestialproducts.com

 



From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Helmut 
Sonderegger (Tele2)
Sent: Monday, October 14, 2013 9:17 AM
To: sundial@uni-koeln.de
Subject: Re: a unique sundial on a cylindrical column of opal glass

 

Hi Roderick,

I like Willys new sundial too.  It looks beautifully.

I included this sundial construction a longer time ago in my software SONNE and 
discussed different cylinder sundials in Compendium vol 16 nr. 4 (Dec 2009). In 
my freeware Sonne.exe you can construct the sundial for the outside of a 
cylinder with fixed orientation and moveable horizontal gnomon (see image 
below). Now Willy has positioned the Gnomon  in the central axis of the 
cylinder and so the gnomon length is equal the radius and nee not be turned 
around. The construction stays the same but the scale is positioned on the 
Northern part of the vertical cylinder instead of South.

By the way: Woody Sulllivan made a very similar construction on the outer side 
of a cone ( http://sundials.org/index.php/component/sundials/onedial/746 )

Helmut Sonderegger
www.helson.at






Am 14.10.2013 06:16, schrieb rodwall1...@gmail.com:





Hi Willy,


 


That’s a great idea, thanks for showing us. Maybe someone will include it in 
their Sundial Software?


 


Roderick Wall.


 



From: Willy Leenders
Sent: ‎Monday‎, ‎October‎ ‎14‎, ‎2013 ‎5‎:‎36‎ ‎AM
To: Sundial sundiallist


 


Dear sundialists,

I calculated a unique sundial on a cylindrical column of opal glass.


 


It is inaugurated in the vicinity of Brussels (Belgium).

The shadow of the sphere falls on the inside of the cylinder and can be seen 
through the opalescent glass on the outside. There the shadow gives an 
indication of the time and the date.

You can see more information specially translated for you in English on my 
website on page http://www.wijzerweb.be/humbeek001AENGLISH.html


 


 






Willy Leenders


Hasselt in Flanders (Belgium)


 


Visit my website about the sundials in the province of Limburg (Flanders) with 
a section 'worth knowing about sundials' (mostly in Dutch): 
http://www.wijzerweb.be


 


 



 

 





---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: a unique sundial on a cylindrical column of opal glass

[rodwall1234]

Hi Helmut,


Ok about Willy’s sundial. I need to install SONNE onto my new Laptop compute 
and see what it can do, thanks. I did have SONNE on my old computer. Willy’s 
sundial is interesting, maybe make one from a drinking glass and paint the hour 
lines using hobby glass paint.


Regard,


Roderick Wall.



From: Helmut Sonderegger (Tele2)
Sent: ‎Tuesday‎, ‎October‎ ‎15‎, ‎2013 ‎12‎:‎17‎ ‎AM
To: sundial@uni-koeln.de

Hi Roderick,

I like Willys new sundial too.  It looks beautifully.

I included this sundial construction a longer time ago in my software SONNE and 
discussed different cylinder sundials in Compendium vol 16 nr. 4 (Dec 2009). In 
my freeware Sonne.exe you can construct the sundial for the outside of a 
cylinder with fixed orientation and moveable horizontal gnomon (see image 
below). Now Willy has positioned the Gnomon  in the central axis of the 
cylinder and so the gnomon length is equal the radius and nee not be turned 
around. The construction stays the same but the scale is positioned on the 
Northern part of the vertical cylinder instead of South.

By the way: Woody Sulllivan made a very similar construction on the outer side 
of a cone ( http://sundials.org/index.php/component/sundials/onedial/746 )

Helmut Sonderegger
www.helson.at





Am 14.10.2013 06:16, schrieb rodwall1...@gmail.com:




Hi Willy,

 

That’s a great idea, thanks for showing us. Maybe someone will include it in 
their Sundial Software?

 

Roderick Wall.

 


From: Willy Leenders
Sent: ‎Monday‎, ‎October‎ ‎14‎, ‎2013 ‎5‎:‎36‎ ‎AM
To: Sundial sundiallist

 

Dear sundialists,

I calculated a unique sundial on a cylindrical column of opal glass.




It is inaugurated in the vicinity of Brussels (Belgium).

The shadow of the sphere falls on the inside of the cylinder and can be seen 
through the opalescent glass on the outside. There the shadow gives an 
indication of the time and the date.

You can see more information specially translated for you in English on my 
website on page http://www.wijzerweb.be/humbeek001AENGLISH.html










Willy Leenders

Hasselt in Flanders (Belgium)




Visit my website about the sundials in the province of Limburg (Flanders) with 
a section 'worth knowing about sundials' (mostly in Dutch): 
http://www.wijzerweb.be












---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: sundial Digest, Vol 94, Issue 12

[rodwall1234]

Hi Art,


Does Valentin Hristov have a website to download his programs from? I’m 
interested in your Laser, where did you get that from, is it costly etc?


Roderick Wall.



From: Art Krenzel
Sent: ‎Tuesday‎, ‎October‎ ‎15‎, ‎2013 ‎2‎:‎32‎ ‎PM
To: sundial@uni-koeln.de


 Roderick
 
Valentin Hristov has a great program to make sundials out of upright glass 
cylinders.  I have made several using graph paper inside the glass tube and 
etched the glass surface using my laser.  They all look beautiful and the 
program is easy to use.
 
He has invented a new program which converted a shepherds dial to a flat plate. 
 I am amazed how simple it is and how well it works.  Valentin is a great 
contact and extremely knowledgeable about his sundial variations.  I recommend 
him very  highly.

Art Krenzel


 


 From: sundial-requ...@uni-koeln.de
 Subject: sundial Digest, Vol 94, Issue 12
 To: sundial@uni-koeln.de
 Date: Tue, 15 Oct 2013 01:22:34 +0200
 
 Send sundial mailing list submissions to
 sundial@uni-koeln.de
 
 To subscribe or unsubscribe via the World Wide Web, visit
 https://lists.uni-koeln.de/mailman/listinfo/sundial
 or, via email, send a message with subject or body 'help' to
 sundial-requ...@uni-koeln.de
 
 You can reach the person managing the list at
 sundial-ow...@uni-koeln.de
 
 When replying, please edit your Subject line so it is more specific
 than Re: Contents of sundial digest...
 
 
 Today's Topics:
 
 1. Re: a unique sundial on a cylindrical column of opal glass
 (rodwall1...@gmail.com)
 2. RE: a unique sundial on a cylindrical column of opal glass
 (John Carmichael)
 
 
 --
 
 Message: 1
 Date: Mon, 14 Oct 2013 21:10:02 +
 From: rodwall1...@gmail.com
 To: Sundial Group sundial@uni-koeln.de,
 =?utf-8?Q?h.sondereg...@utanet.at?= h.sondereg...@utanet.at
 Subject: Re: a unique sundial on a cylindrical column of opal glass
 Message-ID: 525c608a.c464420a.1a4f.1...@mx.google.com
 Content-Type: text/plain; charset=utf-8
 
 Hi Helmut,
 
 
 Ok about Willy?s sundial. I need to install SONNE onto my new Laptop compute 
 and see what it can do, thanks. I did have SONNE on my old computer. Willy?s 
 sundial is interesting, maybe make one from a drinking glass and paint the 
 hour lines using hobby glass paint.
 
 
 Regard,
 
 
 Roderick Wall.
 
 
 
 From: Helmut Sonderegger (Tele2)
 Sent: ?Tuesday?, ?October? ?15?, ?2013 ?12?:?17? ?AM
 To: sundial@uni-koeln.de
 
 Hi Roderick,
 
 I like Willys new sundial too. It looks beautifully.
 
 I included this sundial construction a longer time ago in my software SONNE 
 and discussed different cylinder sundials in Compendium vol 16 nr. 4 (Dec 
 2009). In my freeware Sonne.exe you can construct the sundial for the outside 
 of a cylinder with fixed orientation and moveable horizontal gnomon (see 
 image below). Now Willy has positioned the Gnomon in the central axis of the 
 cylinder and so the gnomon length is equal the radius and nee not be turned 
 around. The construction stays the same but the scale is positioned on the 
 Northern part of the vertical cylinder instead of South.
 
 By the way: Woody Sulllivan made a very similar construction on the outer 
 side of a cone ( http://sundials.org/index.php/component/sundials/onedial/746 
 )
 
 Helmut Sonderegger
 www.helson.at
 
 
 
 
 
 Am 14.10.2013 06:16, schrieb rodwall1...@gmail.com:
 
 
 
 
 Hi Willy,
 
 
 
 That?s a great idea, thanks for showing us. Maybe someone will include it in 
 their Sundial Software?
 
 
 
 Roderick Wall.
 
 
 
 
 From: Willy Leenders
 Sent: ?Monday?, ?October? ?14?, ?2013 ?5?:?36? ?AM
 To: Sundial sundiallist
 
 
 
 Dear sundialists,
 
 I calculated a unique sundial on a cylindrical column of opal glass.
 
 
 
 
 It is inaugurated in the vicinity of Brussels (Belgium).
 
 The shadow of the sphere falls on the inside of the cylinder and can be seen 
 through the opalescent glass on the outside. There the shadow gives an 
 indication of the time and the date.
 
 You can see more information specially translated for you in English on my 
 website on page http://www.wijzerweb.be/humbeek001AENGLISH.html
 
 
 
 
 
 
 
 
 
 
 Willy Leenders
 
 Hasselt in Flanders (Belgium)
 
 
 
 
 Visit my website about the sundials in the province of Limburg (Flanders) 
 with a section 'worth knowing about sundials' (mostly in Dutch): 
 http://www.wijzerweb.be
 
 
 
 
 
 
 
 
 
 
 
 
 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial
 -- next part --
 An HTML attachment was scrubbed...
 URL: 
 https://lists.uni-koeln.de/mailman/private/sundial/attachments/20131014/1b1adc0b/attachment-0001.html
 
 --
 
 Message: 2
 Date: Mon, 14 Oct 2013 16:20:07 -0700
 From: John Carmichael jlcarmich...@comcast.net
 To: 'Willy Leenders' willy.leend...@telenet.be
 Cc: Sundial List sundial@uni-koeln.de
 Subject: RE: a unique sundial on a 

Re: DIALIST

[rodwall1234]

Dialist’s Companion with DOSbox also works on Windows 8.1.


Where would we be without Dialist’s Companion, it is a great program.


Roderick Wall.






From: Brian Albinson
Sent: ‎Friday‎, ‎27‎ ‎December‎, ‎2013 ‎4‎:‎28‎ ‎AM
To: Sundial Group





Hi all;

If anyone is nostalgic for DOS, and has a copy of the Dialist's 
Companion ;  and would like to run it on Windows 7;  I have found 
DOSbox (free) to work well.   DOSBox is also advertised to be compatible 
with  Linux, Mac OS X and OS/2.


Brian Albinson

---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: DIALIST

[rodwall1234]

Dialist’s Companion from NASS:




http://www.sundials.co.uk/nasscomp.htmhttp://www.sundials.co.uk/nasscomp.htm




Roderick.






From: Brad Lufkin
Sent: ‎Friday‎, ‎27‎ ‎December‎, ‎2013 ‎6‎:‎29‎ ‎AM
To: Rod Wall





Roderick:
where can I get the Dialist's Companion?

Regards, Brad




On Thu, Dec 26, 2013 at 12:37 PM, rodwall1...@gmail.com wrote:




Dialist’s Companion with DOSbox also works on Windows 8.1.




Where would we be without Dialist’s Companion, it is a great program.




Roderick Wall.






From: Brian Albinson
Sent: Friday, 27 December, 2013 4:28 AM
To: Sundial Group







Hi all;

If anyone is nostalgic for DOS, and has a copy of the Dialist's 
Companion ;  and would like to run it on Windows 7;  I have found 
DOSbox (free) to work well.   DOSBox is also advertised to be compatible 
with  Linux, Mac OS X and OS/2.


Brian Albinson

---
https://lists.uni-koeln.de/mailman/listinfo/sundial



---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: DIALIST

[rodwall1234]

If you want to run Dialist’s Companion using DOSbox.


(1) Place a shortcut to DOSbox on the desktop.

(2) I have Dialist’s Companion in a folder called “dc” on drive c:.

(3) Place the following batch file on the desktop next to the DOSbox shortcut.


To run Dialist’s Companion just drag the Dialist.bat file and drop it on the 
DOSbox shortcut. 


Dialist.bat---

mount x C:\dc
x:
dialist.exe


-


Someone on this group did the original version on how to use DOSbox but I can’t 
remember who?


Regards,


Roderick Wall.





From: Rod Wall
Sent: ‎Friday‎, ‎27‎ ‎December‎, ‎2013 ‎7‎:‎28‎ ‎AM
To: Brad Lufkin, Sundial Group






Dialist’s Companion from NASS:




http://www.sundials.co.uk/nasscomp.htm




Roderick.






From: Brad Lufkin
Sent: ‎Friday‎, ‎27‎ ‎December‎, ‎2013 ‎6‎:‎29‎ ‎AM
To: Rod Wall





Roderick:
where can I get the Dialist's Companion?

Regards, Brad




On Thu, Dec 26, 2013 at 12:37 PM, rodwall1...@gmail.com wrote:




Dialist’s Companion with DOSbox also works on Windows 8.1.




Where would we be without Dialist’s Companion, it is a great program.




Roderick Wall.






From: Brian Albinson
Sent: Friday, 27 December, 2013 4:28 AM
To: Sundial Group







Hi all;

If anyone is nostalgic for DOS, and has a copy of the Dialist's 
Companion ;  and would like to run it on Windows 7;  I have found 
DOSbox (free) to work well.   DOSBox is also advertised to be compatible 
with  Linux, Mac OS X and OS/2.


Brian Albinson

---
https://lists.uni-koeln.de/mailman/listinfo/sundial



---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: DIALIST

[rodwall1234]

I have even used Dialist’s Companion to point a satellite disc the correct 
azimuth. Wait until the sun is at the required azimuth and then move the disc 
until the LNA horn shadow is in the middle of the disc. And to determine where 
a external North wall is facing.


Roderick Wall

Australia.






From: Brian Albinson
Sent: ‎Friday‎, ‎27‎ ‎December‎, ‎2013 ‎9‎:‎32‎ ‎AM
To: Brad Lufkin, Rod Wall
Cc: Sundial Group




Hi Folk

I don't think DIALIST is available on NASS.Jim Tallman sent me a copy which 
I pass on if you need it.  The file is zipped and renamed because .exe files 
cannot be sent email.

For folk not familiar with the program; besides the standard Sun parameters it 
provides Julian time every second together with Temporal, 
Babylonian,Italian,Sidereal and GMT and sundial motto every day.

One of Fred Sawyer's great contributions to gnomonology.
Brian Albinson

On 12/26/2013 1:55 PM, Brad Lufkin wrote:



Something weird is going on. If I click on the link 
http://www.shadow.net/~bobt/dcomp/dcomp.htm 

on the page 

http://www.sundials.co.uk/nasscomp.htm 

I get a page having to do with vaporizers! 

http://vapeforest.com/reviews/

Anyone know (or can figure out) what's going on?

Brad




On Thu, Dec 26, 2013 at 3:28 PM, rodwall1...@gmail.com wrote:





Dialist’s Companion from NASS:




http://www.sundials.co.uk/nasscomp.htmhttp://www.sundials.co.uk/nasscomp.htm




Roderick.






From: Brad Lufkin
Sent: Friday, 27 December, 2013 6:29 AM
To: Rod Wall





Roderick: 
where can I get the Dialist's Companion?

Regards, Brad




On Thu, Dec 26, 2013 at 12:37 PM, rodwall1...@gmail.com wrote:




Dialist’s Companion with DOSbox also works on Windows 8.1.




Where would we be without Dialist’s Companion, it is a great program.




Roderick Wall.






From: Brian Albinson
Sent: Friday, 27 December, 2013 4:28 AM
To: Sundial Group







Hi all;

If anyone is nostalgic for DOS, and has a copy of the Dialist's 
Companion ;  and would like to run it on Windows 7;  I have found 
DOSbox (free) to work well.   DOSBox is also advertised to be compatible 
with  Linux, Mac OS X and OS/2.


Brian Albinson

---
https://lists.uni-koeln.de/mailman/listinfo/sundial



---
https://lists.uni-koeln.de/mailman/listinfo/sundial







---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: A world map of the discrepancy between civil and solar time.

[rodwall1234]

Hi Steve,




This map is interesting as it really says something. Have a look at Greenland, 
China and Russia. Greenland covers 5 time zones with a square red section in 
East Greenland being completely different. This section looks like it maybe the 
same time zone as Iceland, I wonder why, could it be trade? China only has one 
time zone and it covers 5 time zones. West China time is so red it is nearly 
black . And Russia only has two places where the sun would be directly above 
you at 12 Noon, yet it covers 11 time zones.




I also remember that some Island countries to the East of Australia changing 
the Date line so that they are trading in the same day as Australia. Because 
most of their trade was to the West of them. It maybe the reason for the 
horizontal “T” shape in the Date line.




A very interesting map.




Thanks,




Roderick Wall.








From: Steve Lelievre
Sent: ‎Saturday‎, ‎8‎ ‎March‎, ‎2014 ‎8‎:‎03‎ ‎AM
To: Sundial Group





Hello everyone,

Some fellow has coloured a world map to show the difference between the 
time zones and local solar time worldwide.  See
http://poisson.phc.unipi.it/~maggiolo/index.php/2014/01/how-much-is-time-wrong-around-the-world/

Click the small map on the this blog to see the map in full screen. It 
look like he's done it using Standard Time rather than Daylight Saving.

I live in New Brunswick, Canada. We're slightly pink.

Steve




---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: A world map of the discrepancy between civil and solar time.

[rodwall1234]

And in the most Western part of China. China Standard time (CST) would be 3 
hours different than their sundial time. I wonder if there are photos showing 
this?


http://www.timeanddate.com/library/abbreviations/timezones/asia/cst.html


Roderick.






From: Rod Wall
Sent: ‎Sunday‎, ‎9‎ ‎March‎, ‎2014 ‎9‎:‎32‎ ‎AM
To: Sundial Group






Hi Steve,




This map is interesting as it really says something. Have a look at Greenland, 
China and Russia. Greenland covers 5 time zones with a square red section in 
East Greenland being completely different. This section looks like it maybe the 
same time zone as Iceland, I wonder why, could it be trade? China only has one 
time zone and it covers 5 time zones. West China time is so red it is nearly 
black . And Russia only has two places where the sun would be directly above 
you at 12 Noon, yet it covers 11 time zones.




I also remember that some Island countries to the East of Australia changing 
the Date line so that they are trading in the same day as Australia. Because 
most of their trade was to the West of them. It maybe the reason for the 
horizontal “T” shape in the Date line.




A very interesting map.




Thanks,




Roderick Wall.










From: Steve Lelievre
Sent: ‎Saturday‎, ‎8‎ ‎March‎, ‎2014 ‎8‎:‎03‎ ‎AM
To: Sundial Group





Hello everyone,

Some fellow has coloured a world map to show the difference between the 
time zones and local solar time worldwide.  See
http://poisson.phc.unipi.it/~maggiolo/index.php/2014/01/how-much-is-time-wrong-around-the-world/

Click the small map on the this blog to see the map in full screen. It 
look like he's done it using Standard Time rather than Daylight Saving.

I live in New Brunswick, Canada. We're slightly pink.

Steve




---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: British Renaissance and sundials

[rodwall1234]

It is on Youtube:




https://www.youtube.com/watch?v=OGqgswZ3FJk




A good video converter that converts Youtube videos which you can then download 
your own personal copy:

http://world.onlinevideoconverter.com/free-video-converter.aspx#




Roderick Wall.






From: fwsaw...@gmail.com
Sent: ‎Sunday‎, ‎23‎ ‎March‎, ‎2014 ‎6‎:‎26‎ ‎AM
To: araignee
Cc: Sundial Group







See https://vpnreviewer.com/bestukvpn-com-review for info on bestukvpn which 
allows free connection to the BBC iplayer from US accounts.


Fred Sawyer



On Sat, Mar 22, 2014 at 11:29 AM, araignee araig...@etesseract.com wrote:

Hello,

Thanks for the link.  But in the U.S. we get this message:  Currently BBC 
iPlayer TV programmes are available to play in the UK only, but all BBC iPlayer 
Radio programmes are available to you.  The mysteries of big business...

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 Mar 22, 2014, at 4:35 AM, Gabriele Kuhn wrote:

 http://www.bbc.co.uk/iplayer/episode/b03yzjy6/A_Very_British_Renaissance_The_Renaissance_Arrives/
 gabriele.k...@btinternet.com



 On 21 Mar 2014, at 22:06, Douglas Bateman wrote:

 I have just seen an excellent BBC programme called A Very British 
 Renaissance. The presenter, Dr James Fox, included the painting by Holbein - 
 The Ambassadors, and gave full credit to Nicholas Kratzner with the 
 presenter handling Kratzner's personal polyhedral dial. He also conducted an 
 interview with one of our top dial makers, Joanna Migdal, in her studio.

 I gather not all will be able to see the BBC iPlayer, but worth a try. 
 Perhaps some clever member could extract the relevant section of the 
 programme.

 Best wishes, Doug

 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial



 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial





---
https://lists.uni-koeln.de/mailman/listinfo/sundial---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: British Renaissance and sundials

[rodwall1234]

Hi Thierry,


I didn’t go to BBC iplayer, I went straight to Youtube. I have downloaded a few 
good BBC Science shows and I remembered this. Good to remember that BBC shows 
maybe on Youtube.


I Note that when I viewed the video there was 76 viewers. There are now 96 in 
the last hour. I wonder how many are from our group? It was only put on Youtube 
on the 21 March.


Regards,


Roderick Wall.





From: Thierry van Steenberghe
Sent: ‎Sunday‎, ‎23‎ ‎March‎, ‎2014 ‎9‎:‎18‎ ‎AM
To: Rod Wall




Dear Roderick,

thanks a lot for this, I watched the video with utmost pleasure, especially 
after the frustration of seeing the BBC iplayer video being forbidden from 
outside UK...

I hope the second part of this excellent broadcast will also be available on 
YouTube!

Kindest regards,
Thierry

___

Thierry van Steenberghe
Brussels
___




On 22/03/2014 21:44, rodwall1...@gmail.com wrote: 


It is on Youtube:




https://www.youtube.com/watch?v=OGqgswZ3FJk




A good video converter that converts Youtube videos which you can then download 
your own personal copy:

http://world.onlinevideoconverter.com/free-video-converter.aspx#




Roderick Wall.






From: fwsaw...@gmail.com
Sent: ‎Sunday‎, ‎23‎ ‎March‎, ‎2014 ‎6‎:‎26‎ ‎AM
To: araignee
Cc: Sundial Group







See https://vpnreviewer.com/bestukvpn-com-review for info on bestukvpn which 
allows free connection to the BBC iplayer from US accounts.


Fred Sawyer



On Sat, Mar 22, 2014 at 11:29 AM, araignee araig...@etesseract.com wrote:

Hello,

Thanks for the link.  But in the U.S. we get this message:  Currently BBC 
iPlayer TV programmes are available to play in the UK only, but all BBC iPlayer 
Radio programmes are available to you.  The mysteries of big business...

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 Mar 22, 2014, at 4:35 AM, Gabriele Kuhn wrote:

 http://www.bbc.co.uk/iplayer/episode/b03yzjy6/A_Very_British_Renaissance_The_Renaissance_Arrives/
 gabriele.k...@btinternet.com



 On 21 Mar 2014, at 22:06, Douglas Bateman wrote:

 I have just seen an excellent BBC programme called A Very British 
 Renaissance. The presenter, Dr James Fox, included the painting by Holbein - 
 The Ambassadors, and gave full credit to Nicholas Kratzner with the 
 presenter handling Kratzner's personal polyhedral dial. He also conducted an 
 interview with one of our top dial makers, Joanna Migdal, in her studio.

 I gather not all will be able to see the BBC iPlayer, but worth a try. 
 Perhaps some clever member could extract the relevant section of the 
 programme.

 Best wishes, Doug

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Re: Veteran's Memorial Aperture Dial - Anthem Arizona

[rodwall1234]

Very interesting. Would I be correct in saying that some of the photos were not 
taken on the 11th hour on the 11th month? By looking at the shadows on the edge 
of the projected image, it looks as if the date is after the 11th Nov. And 
would it have another perfect image when the sun latitude changes in the other 
direction in another month?




Roderick Wall.






From: Tony Moss
Sent: ‎Saturday‎, ‎November‎ ‎15‎, ‎2014 ‎10‎:‎29‎ ‎AM
To: jlcarmich...@comcast.net, sundial@uni-koeln.de





GLORIOUS!  What a beautiful concept.

Tony Moss.








-Original Message-
From: John Carmichael jlcarmich...@comcast.net
To: Sundial List sundial@uni-koeln.de
Sent: Fri, 14 Nov 2014 21:01
Subject: FW: Veteran's Memorial Aperture Dial - Anthem Arizona




Hello All:

 

I just became aware of this beautiful monumental aperture dial in Anthem 
Arizona.  I know nothing about the designer. –but is worth seeing.  Note the 
elliptical apertures in the vertical stones.

 

 



Subject: Veteran's Memorial - Anthem 







http://twistedsifter.com/2014/11/anthem-arizona-veterans-memorial/


 

 

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Re: sundial Digest, Vol 111, Issue 6

[rodwall1234]

Hi Frank,

A comment:
As Australia is in the southern hemisphere the satellite disc all face North 
not South.

I have used the position of the sun to set the Azimuth of the satellite disc. 
1st determine the time the sun has the same Azimuth. Then at that time adjust 
the disc Azimuth so that the shadow of the horn is in the middle of the disc. 
To finish, the altitude of the disc needs to be set. For correct adjustment you 
1st need to make sure the arm holding the horn is at 90 deg to the disc.

Roderick Wall.

Frank Evans frankev...@zooplankton.co.uk wrote:

AsImayhavementionedoncebefore,justlookatthesatellitedishesonthehouses.Theyareaimednotfarfromsouth.Youcangetthetimethatway,too.MaybeeventheAustralianAboriginalpeopledothatnowadays.Bytheway,ataBSSmeetingamemberonceshoweda(working)satellitedishtowhichhehadaddedasundial.Anevenbetterwayoftellingthetime!Frank55N1WOn08/03/201518:19,ArtKrenzelwrote:WhenIwasstationedinEnglandduringtheearly1970's,IhadaproblemorientingmyselfwhenIfirstgotoutofthesubway.SoIdevelopedamethodwherebyIaimedthehourhandofmywatchatthesunanddividedthearcbetweenthehourhandand12o'clockintotwoequalparts.Ithendrewanimaginarylinefromthecenterofthewatchtothecenterofthatarcandthatline,whenextended,pointedtotheSouth.ItwascrudebutquickandIdidnotneedanyotheritemstomakeitwork.Ofcourse,accesstothesunwasabitofaprobleminEnglandattimes.Iofferthisinformationasamoderndaycorollarytotheaboriginalsundialonhishand.ArtKrenzelToday'sTopics:1.Re:TellingtimeinoutbackQueenslandintheearly20thcentury(rodwall1234)2.Re:TellingtimeinoutbackQueenslandintheearly20thcentury(JohnPickard)3.RE:TellingtimeinoutbackQueenslandintheearly20thcentury(Schechner,Sara)--Message:1Date:Sun,08Mar201509:56:10+1100From:rodwall1234rodwall1234@gmail.comTo:johnpickardjohn.pick...@bigpond.com,sundial@uni-koeln.deSubject:Re:TellingtimeinoutbackQueenslandintheearly20thcenturyMessage-ID:sdgpaeb27r5vrihvof195ugj.1425768970727@email.android.comContent-Type:text/plain;charset=utf-8HiJohn,Thanksthatisinteresting.IhavealwaysthoughabouthowourAustralianAboriginalsdeterminedtime.Doyouhaveanyinformationonthat?Regards,RoderickWall.---https://lists.uni-koeln.de/mailman/listinfo/sundial---
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Re: Telling time in outback Queensland in the early 20th century

[rodwall1234]

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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RE: Reflecting Dials

[rodwall1234]

Hi Carlo,

The reflection dial is lovely.

Question: What is the expected life span for the projection screen when placed 
outside in the rain, snow and sun.

Regards,

Roderick Wall.

Dave Bell db...@thebells.net wrote:

Carlo, that is a beautiful dial and seriously interesting concept for a
reflecting design! The manufacturing process is very clever, with the laser
and NC machining of the spherical dial face. Perfect for automating the
localization and any customization required.

Is the concave mirror stainless steel? It appears as if your process
measures the focal length after polishing.

Can you customize your design for outside of Europe? I'd be tempted to
enquire about one for California, but I suspect the cost would be outside my
budget. :{)

Dave

-Original Message-
From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Helios
Sonnenuhren (Carlo Heller)
Sent: Friday, April 03, 2015 11:18 PM
To: sundial@uni-koeln.de
Subject: Re: Reflecting Dials

Dear Claude,

if you are looking for reflecting dials other then ceiling dials this 
dial may be interesting for you:
http://www.helios-sundials.com/Helios-Sundial-Gallery.html

Kind regards
Carlo



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Re: Reflecting Dials

[rodwall1234]

Hi Carlo,

Thanks for your reply.

Regards,

Roderick Wall.

Helios Sonnenuhren (Carlo Heller) carlohel...@helios-sonnenuhren.de wrote:

Hi Roderick,

thank you.

The globe screen is made of acrylic glass (PMMA). This is the best 
plastic material concerning the weathering-resistance. My Subsolaris is 
13 years old now and is still good-looking and precise.

Kind regards

Carlo Heller



http://www.helios-sonnenuhren.de

Am 05.04.2015 um 04:16 schrieb rodwall1234:
 Hi Carlo,

 The reflection dial is lovely.

 Question: What is the expected life span for the projection screen when 
 placed outside in the rain, snow and sun.

 Regards,

 Roderick Wall.

 Dave Bell db...@thebells.net wrote:

 Carlo, that is a beautiful dial and seriously interesting concept for a
 reflecting design! The manufacturing process is very clever, with the laser
 and NC machining of the spherical dial face. Perfect for automating the
 localization and any customization required.

 Is the concave mirror stainless steel? It appears as if your process
 measures the focal length after polishing.

 Can you customize your design for outside of Europe? I'd be tempted to
 enquire about one for California, but I suspect the cost would be outside my
 budget. :{)

 Dave

 -Original Message-
 From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Helios
 Sonnenuhren (Carlo Heller)
 Sent: Friday, April 03, 2015 11:18 PM
 To: sundial@uni-koeln.de
 Subject: Re: Reflecting Dials

 Dear Claude,

 if you are looking for reflecting dials other then ceiling dials this
 dial may be interesting for you:
 http://www.helios-sundials.com/Helios-Sundial-Gallery.html

 Kind regards
 Carlo



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Re: Sundial for the visually impaired

[rodwall1234]

Hi Dan,

If you do a Google search using sundial for the blind and you will find a 
number of them.

Roderick Wall.

On Jun 10, 2015 6:35 PM, Dan Uza cerculdest...@gmail.com wrote:

 Hello, 

 I was wondering: has anyone designed a sundial for the blind? Can there be 
 one? How do you make people feel the shadow?

 Dan Uza---
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Re: Happy winter solstice!

[rodwall1234]

Hi John,

Yes and it is cold and cloudy here in Melbourne Victoria. Looking forward to 
summer.

Roderick.

On Jun 21, 2015 9:54 AM, John Pickard john.pick...@bigpond.com wrote:

 Happy winter solstice to everyone! 

 Now the days get longer, the weather gets warmer, and summer is one the way! 
 (Except for all those stranded in the Northern Hemisphere, where you only 
 have winter to look forward to.) 


 Cheers, John 

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

 (in a rather chilly Sydney, Australia) 

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Re: Southern Hemisphere

[rodwall1234]

Hi Phil again,

The sundial normally needs to be designed for your latitude. That is the Gnomon 
angle to the face plate is the same as your latitude. But if it is designed for 
some other latitude. It will still work OK. So long as you make the shadow 
forming edge of the Gnomon parallel to the axis of the earth. And not make the 
face plate horizontal.

Another point is that the numbers go around the face clockwise in the Northern 
hemisphere. While in the southern hemisphere they are anticlockwise.

You may like to check your sundial. Because if it was imported into Australia, 
it may have been designed for the northern hemisphere.

Regards,

Roderick Wall.

On Nov 16, 2015 9:37 AM, Phil Dorman  wrote:
>
> Hi Everyone,
>
>  
>
> I joined this list because I have a specific question which I can’t find a 
> definitive answer to.
>
>  
>
> I want to install a sundial at Perth WA Australia which is pretty close to 
> 32deg South latitude.
>
> From what I can determine that means the Gnomon should be 32deg above 
> horizontal.
>
> Or is that just for the Northern Hemisphere ??
>
>  
>
> As I move North in Australia the Latitude number gets Smaller
>
> Eg Latitude of Brisbane QLD (further North) is 27.46deg
>
> So presumably the Latitude at the Equator would be Zero !
>
> Which would mean a sundial Gnomon at the Equator would be Horizontal ie Flat 
> on the Ground
>
> Which of course would not work.
>
> And at the South Pole it would be Vertical 90deg from Horizontal and also 
> would not work since there would be no ground for the shadow to fall on.
>
>  
>
> So. Am I correct to put it at 32deg from Horizontal for Perth WA or not ?
>
>  
>
> Phil Dorman /:~)>
>
> Machinery Appreciation & Transport Engineering Society
> 946 Wattagan Crk Rd
> Watagan NSW 2325
>
> 0419 501285
>
>  
>
>  ---
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Re: Southern Hemisphere

[rodwall1234]

Hi Phil,

The shadow forming edge of the Gnomon must be parallel the the axis of the 
earth. To do that the shadow forming edge of the Gnomon is set to be the same 
as your latitude. The only difference in the southern hemisphere is the the tip 
of the Gnomon is facing South. While in the Northern hemisphere it faces to the 
North. Doing this keeps the shadow forming edge of the Gnomon parallel to the 
axis of the earth, whatever the location.

Roderick Wall, 
Melbourne
Australia.

On Nov 16, 2015 9:37 AM, Phil Dorman  wrote:
>
> Hi Everyone,
>
>  
>
> I joined this list because I have a specific question which I can’t find a 
> definitive answer to.
>
>  
>
> I want to install a sundial at Perth WA Australia which is pretty close to 
> 32deg South latitude.
>
> From what I can determine that means the Gnomon should be 32deg above 
> horizontal.
>
> Or is that just for the Northern Hemisphere ??
>
>  
>
> As I move North in Australia the Latitude number gets Smaller
>
> Eg Latitude of Brisbane QLD (further North) is 27.46deg
>
> So presumably the Latitude at the Equator would be Zero !
>
> Which would mean a sundial Gnomon at the Equator would be Horizontal ie Flat 
> on the Ground
>
> Which of course would not work.
>
> And at the South Pole it would be Vertical 90deg from Horizontal and also 
> would not work since there would be no ground for the shadow to fall on.
>
>  
>
> So. Am I correct to put it at 32deg from Horizontal for Perth WA or not ?
>
>  
>
> Phil Dorman /:~)>
>
> Machinery Appreciation & Transport Engineering Society
> 946 Wattagan Crk Rd
> Watagan NSW 2325
>
> 0419 501285
>
>  
>
>  ---
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Re: Gnomon Gap Puzzle

[rodwall1234]

Hi Frank,
Thanks for the Gnomon Gap Puzzle.  Learnt a lot from it. That is what makes 
sundials interesting. Always something new to learn.
Great for the northern hemisphere. Does the book include a printout for the 
southern hemisphere?
When I printed the dial onto A4 paper. It did  not print correctly. It was 
close to being a square image. Would a pdf version be better.
Thanks,
Roderick Wall. 

 Original message From: Frank King  Date: 
3/1/19  11:48 pm  (GMT+10:00) To: Sundial List  Subject: 
Re: Gnomon Gap Puzzle 
Dear All,

I have a simple rule with my puzzles: wait for a reply from Geoff Thurston and 
then reveal all.  The time has come!

In the recent spate of messages, both Bill Gottesman and Steve Lelievre were 
very close.  Bill is the only person to suggest an azimuthal dial with  
vertical styles (which describes my design) but Steve's drawing (despite the 
polar styles) is remarkably close to my design too.

The 'unusual space' is "The End-Flap of a Book" - not easy to guess!

By arranging for the top and bottom edges of the front cover to serve as 
vertical gnomons, you can mark out an azimuthal dial on the end-flap.  This 
way the user doesn't need to supply a gnomon, nor is there any need for any 
kind of pop-out gnomon.

The sundial is shown in operation outdoors in the real sun at:

 http://www.cl.cam.ac.uk/users/fhk1/Sundials/GnomonGapDial.jpg

This shows what the design looks like.  There are many forms of azimuthal dial 
but, as one who enjoys astrolabes, I like stereographic projections.  [OK, I 
do realise that my design uses the zenith as the centre of the projection and 
not the NCP!]

In terms of 'looking good', this design hardly competes with the Nuremburg or 
Harvard dials or the dials in the stunning images that Sara has just sent us.  
We can all look forward to the Adler catalogue.  Sadly, those dials look a bit 
expensive.

The link above shows the upmarket version of my design and this costs 15 GBP 
but you do get a book bundled in at no extra charge!  There are lots of pretty 
pictures of sundials inside.

What about implementing the design for less than a dime?

Well, a dime is about what it costs me to print out a sheet of paper, and all 
you have to do is to print out the following:

 http://www.cl.cam.ac.uk/users/fhk1/Sundials/DoubleGapDial.jpg

This is intended for A4-paper.  You may have to trim the edges if you use 
LETTER size.

This shows what is hidden on the inside back cover of the book.  That is where 
the early morning and late evening summer-time hours are found.

All you have to do is to fold along the black straight line (a valley fold not 
a ridge fold), place the S-part flat on a horizontal table, and point the S to 
SOUTH [some users find this a bit surprising!]. You must arrange for the 
larger part to be perpendicular to the S-part.

In summer, in the early morning and late afternoon, you have to place the 
larger part flat on the table; the edges of the S-part then serve as gnomons.

This really is a working diptych sundial and they don't come any cheaper!

Sadly it is designed for my latitude +52d 12m but anyone who has read this far 
is likely to be well equipped to adapt the design for another latitude.
 
Adventurous readers can add the appropriate wiggles to the hour lines to deal 
with longitude offset and EoT.  Maybe it would be best to design two such 
dials (one on each side of the paper), with December to June hour lines on one 
side and June to December hour lines on the other.

In the unlikely event that you might want the up-market version (with book 
attached) please contact:

  Hallam Kindersley 

Very best wishes

Frank




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Re: The Great Melbourne Telescope (slightly peripheral to the List)

[rodwall1234]

Hi John,
Thanks for the information on the GMT. As we live not far from it we will take 
a trip to see it. Will take some photos.
Thanks,
Roderick Wall. 


Sent from my Samsung Galaxy smartphone.
 Original message From: john.pick...@bigpond.com Date: 14/9/18  
9:52 am  (GMT+10:00) To: Sundial List  Subject: The Great 
Melbourne Telescope (slightly peripheral to the List) 
Good morning,

I received this news piece from another group I’m on, and thought it might 
interest List members.

***
The Great Melbourne Telescope

The Great Melbourne Telescope (GMT) is being restored after sitting 
ingloriously out in the weather in Canberra for several years.

The Great Melbourne Telescope was built in Dublin in 1868 and erected at 
Melbourne Observatory in 1869. At the time it was the second largest 
telescope in the world and the largest in the southern hemisphere.

When Melbourne Observatory closed in 1944, the telescope was sold to the 
Commonwealth Observatory at Mount Stromlo, Canberra. At Mount Stromlo the 
telescope was given a new 50-inch glass mirror and became an integral part 
of Mt Stromlo’s work from 1961 into the 1970s. In the 1990s the telescope 
was rebuilt with two large-scale digital cameras for the search for evidence 
of dark matter. Then in January 2003 a bushfire swept across Mt Stromlo, its 
firestorm destroying the majority of the telescopes and buildings. Only the 
large iron castings from the GMT, bent metal and broken glass remained.

Unloved and broken it sat in the extreme cold of Canberra’s weather for at 
least four years until members of the Astronomical Society of Victoria (ASV) 
embarked on a mission to rescue it in 2008. Lacking plans or drawings and 
missing at least 180 parts, a team of ASV volunteers has been painstakingly 
dismantling it in a large restoration area in Melbourne.  Every available 
working part has been identified, numbered, restored or rebuilt.

The GMT was built with a speculum mirror lens and is the last of the great 
mirrored telescopes. An unforgettable moment for the restoration team came 
in 2010 when a staff member found a box in the museum’s store and called for 
expert help to confirm the contents. The box contained the original 
flotation system for the telescope’s one-ton white bronze mirror. It was a 
joyous day for the GMT reconstruction team who had long wondered what had 
happened to this item of 19th century engineering which provides a balanced 
bed of 48 steel balls to support the back surface of the mirror evenly, 
keeping distortion of the mirror surface to less than a 1/10,000th 
millimetre.

The dollar value of the ASV work is incalculable, unlike the restoration 
costs. Funding for the project is an ongoing challenge. The replacement 
mirror alone, is likely to be in excess of $200,000. Many parts of the GMT 
can be repaired or remade in the restoration area by the combined efforts of 
Museum Victoria staff and the ASV volunteers. When larger equipment is 
required, it is manufactured by the staff at Scienceworks.

A 2-metre high photograph of the telescope from 1885 is a key reference for 
the group as they establish which parts are original and which were replaced 
at Mt Stromlo Observatory. The ASV team hope to have the GMT back home at 
Observatory House in 2019 to coincide with the 150th anniversary of its 
arrival in Melbourne. Everyone interested in following the progress of the 
GMT restoration or wanting to donate to this great cause can do so through 
www.greatmelbournetelescope.org.au

Written from information at www.greatmelbournetelescope.org.au and an 
article written by Liz Clarkson (also on the GMT website).

*


Cheers, John

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

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Re: Orologi Solari n. 18

[rodwall1234]

Hi Gina,What a lovely magazine. Subjects all sound very intresting. But only if 
I  could read it in English as that is all I know.Regards,Roderick Wall. Sent 
from my Samsung Galaxy smartphone.
 Original message From: Gian Casalegno 
 Date: 8/5/19  3:56 am  (GMT+10:00) To: sundial 
 Subject: Orologi Solari n. 18 Dear friends,a new issue 
of the Italian magazine Orologi Solari is available for download from the usual 
site http://www.orologisolari.eu/.Here is the list of articles together with a 
short abstract:1. "A sundial made inside a cone" by Aironi JohnWe describe a 
sundial drawn inside a hollow cone, with a slit and a gnomonic hole on a 
generatrix. Sunlight penetrating inside the cone through a slit projects on the 
inner surface of the cone a light strip indicating the time. The formulas for 
tracing hour lines and calendar lines are shown.2. "Ancient hour circles on the 
sphere are not maximum circles. Clavio's demonstration with AutocadLT." by 
Albéri Auber PaoloCristoforo Clavio, after a long discussion with his 
colleagues, finally offered a demonstration that the maximum circle of ancient 
time relative to two antisymmetric declination circles is different for each 
pair of chosen declination circles, that is to say that the hour lines relative 
to the ancient hour are not maximum circles. Here we propose a simplified 
demonstration with images taken from AutocadLT geometric constructions.3. 
"Small composite sundials" by Anselmi RiccardoThe author presents a model of a 
gnomonic hole dial made with an ice cream container. In particular two 
specimens are shown and described declining respectively to the south and to 
the west.4. "The millstone of time" by Baggio FrancescoThis article describes a 
horizontal mobile gnomon sundial already manufactured and registered in Sundial 
Atlas with the code IT013689. Project steps are explained and possible variants 
are proposed.5. "An app for dialists… aspirant clockmakers" by Casalegno 
GianpieroThe author describes an Android app that simulates some famous tower 
clocks. The main features are described trying to underline the most 
interesting aspects for a gnomonist.6. "Definition of the orientation of a flat 
wall" by Caviglia FrancescoThe definitions used by gnomonists for the 
parameters that specify the orientation of a flat wall (gnomonic declination 
and inclination or slope) are here discussed. Unambiguous and suitable 
operational definitions are provided and some proposals are advanced.7. "A 
reflection behind the other: the double-mirror" by Ferro Milone 
FrancescoDouble-reflection geographic sundials are realized by using 
double-mirrors. The project is carried out with the help of a dynamic software 
(Geogebra), a geographical one (GMT) and a gnomonic one (Orologi Solari by 
Gianpiero Casalegno). Three computing examples and a project image terminate 
the article.8. "And before Foster ?" by Gunella AlessandroThe author wants to 
remind the reader that the use of "rulers" in the construction of sundials, a 
method generally attributed to Samuel Foster, was actually already proposed in 
the previous century. In particular an instrument is shown as already described 
by Clavius and probably of Germanic origin.9. "The analemma and the Cathedral 
of Majorca" by Pol i Llompart Josep Lluís, Ruiz-Aguilera DanielThe authors 
describe the cathedral of Majorca and explain how they made the photos of the 
solar analmma above the "cathedral of light".10. "A Roman portable watch" by 
Quadri UlisseThe author describes the use and the principle of operation of a 
portable solar clock from the Roman era, kept at the Museum of the History of 
Science in Oxford and of which he made a copy in brass and steel.A digital 
bonus can also be downloaded for additional reference material.Hope you will 
enjoy the reading, although in Italian only.Ciao.Gian Casalegno 

  
Mail priva di virus. www.avast.com  



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