RE: sundial Digest, Vol 143, Issue 5

[Art Krenzel]

Nice tour!  I am most interested in getting photos of Luang Prabang, Laos.  
That was a provincial capital during the Vietnam War and I visited the area 
several times a week at 480 knots and 4000 ft AGL.  It was not heavily bombed 
however it was associated with the Pathet Lao who were the native rebels 
sponsored by N. Vietnam.  I am sure there is no evidence left of the war but 
the craters really start about 100 miles east of there.

I am looking forward to seeing your photos.  As you fly to Hanoi, look for 
circular ponds on the ground which are bomb craters.  See if there is any 
evidence of the war there.

It sounds like fun.

Art


From: sundial-requ...@uni-koeln.de
Sent: Sunday, November 5, 2017 9:12 AM
To: sundial@uni-koeln.de
Subject: sundial Digest, Vol 143, Issue 5

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Today's Topics:

   1. Re: Sundial books for children (Paul Ratto)


--

Message: 1
Date: Sun, 05 Nov 2017 12:01:27 EST
From: Paul Ratto 
To: sundial@uni-koeln.de
Subject: Re: Sundial books for children
Message-ID: <5bf04f9656.sunclock...@icloud.com>
Content-Type: text/plain; charset="us-ascii"

In message 

  Michael Ossipoff  wrote:

> Show them sundials that can be explained to them. I think that people will
> like something better, enjoy it more, if they know how it works.
>
> As much as I like the Analemmatic Dial, I prefer (at least at first)
> showing people sundials that they'd be willing to listen to an explanation
> of.   ...or dials whose explanation is brief.
>
> So, that would rule-out the Analemmatic, and declining flat dials, and
> altitude dials.
>
> The Horizontal Dial, closely derived from the Equatorial Dial, has a brief
> and intuitive explanation. Likewise the South Vertical  Dial, the Polar
> Dial, and any north or south Reclining Dial. (They're like Horizontal Dials
> for different latitudes). (They could be summarized as any dial whose
> plate's normal is in the plane of the meridian).
>
> Of course the Equatorial Dials are the most obvious and natural of all, not
> really requiring explanation. (By "Equatorial", I mean any dial that
> directly shows a shadow's or lightspot's movement around the equatorial
> plane by uniformly-spaced marks around a circle in that plane)
>
> My favorite for a south windowsill is the Circumference-Aperture
> Cylinder-Equatorial, but I'd want to include, with it, at least a
> *description* of the geometric demonstration of its principle. (My
> girlfriend doesn't care for geometry or math, but she's going to hear about
> the geometry of a Circumference-Aperture Cylindrical-Equatorial.)
>
> Declining flat dials, altitude dials, the Analemmatic Dial, and the
> Circumference-Aperture Cylinder-Equatorial are good ways of inspiring
> interest in, and demonstrating, some geometry or astronomical mathematics.
> Emphasize to  the person, that those subjects are relevant and interesting,
> and useful.
>
> It seems to me that those dials would be especially a good idea for school
> math classes, or for when someone's child is taking such courses.
>
> Michael Ossipoff
>


Although I am not aware of Sundial books written SPECIFICALLY for
children, several (mainly Analemmatics due to their 'interactive'
nature) are certainly featured within some School-books - and you
could view examples at website: 
https://nam03.safelinks.protection.outlook.com/?url=www.sunclocks.com%2Fdata%2Fschool.htm=02%7C01%7Cphoenix98604%40msn.com%7C73d11b150af54a75df5d08d524706ead%7C84df9e7fe9f640afb435%7C1%7C0%7C636454987682268345=LNbneDQEArrRHOrWw1mlT9G3lrJEjUuIl7jMr%2BC0UbA%3D=0

If you want to interest children in the subject of Sundials - then
I suggest that you visit some Schools and give a 'presentation' to
them - as in the attached photograph, showing Slaven Licina giving
such a talk.  You can visit his own website at: 

Unusual bi-annual sundial

[Art Krenzel]

I have been to Arizona many times but never saw this "working sundial" of 
sorts.  It is on my bucket list now.


I thought you might enjoy watching the beauty of math, the sun and time all 
coming together.  There is a 30 second video of the solar display near the 
bottom of the opening page at this URL.


http://www.onlineatanthem.com/anthem-veterans-memorial

Anthem Veterans Memorial | Online At 
Anthem<http://www.onlineatanthem.com/anthem-veterans-memorial>
www.onlineatanthem.com
Reserve the Anthem Veterans Memorial area for a special ceremony or event. 
Please refer to the ACC Board Policy Manual for a complete list of facility 
rules and ...


Enjoy!


Art Krenzel



















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Number of sundials

[Art Krenzel]

Here is a good question for such an august group of sundialists (and I don't 
know the real answer).  Which city in the world has the most sundials and how 
many do they have?

Art Krenzel

 
 


  



 












 


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RE: sundial Digest, Vol 111, Issue 6

[Art Krenzel]

When I was stationed in England during the early 1970's, I had a problem 
orienting myself when I first got out of the subway.  So I developed a method 
whereby I aimed the hour hand of my watch at the sun and divided the arc 
between the hour hand and 12 o'clock into two equal parts.  I then drew an 
imaginary line from the center of the watch to the center of that arc and that 
line, when extended, pointed to the South.  It was crude but quick and I did 
not need any other items to make it work.  Of course, access to the sun was a 
bit of a problem in England at times.
 
I offer this information as a modern day corollary to the aboriginal sundial on 
his hand. 

Art Krenzel


 
 Today's Topics:
 
1. Re: Telling time in outback Queensland in the early 20th
   century (rodwall1234)
2. Re: Telling time in outback Queensland in the early 20th
   century (John Pickard)
3. RE: Telling time in outback Queensland in the early 20th
   century (Schechner, Sara)
 
 
 --
 
 Message: 1
 Date: Sun, 08 Mar 2015 09:56:10 +1100
 From: rodwall1234 rodwall1...@gmail.com
 To: John Pickard john.pick...@bigpond.com, sundial@uni-koeln.de
 Subject: Re: Telling time in outback Queensland in the early 20th
   century
 Message-ID: sdgpaeb27r5vrihvof195ugj.1425768970...@email.android.com
 Content-Type: text/plain; charset=utf-8
 
 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.
 

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RE: sundial Digest, Vol 94, Issue 18

[Art Krenzel]

Helmut,
 
Valentin has created another variation of the cylindrical sundial.  He 
converted the cylinder to a flat wall with morning hours on one side and 
afternoon hours on the other side.  It looks like a giant capital I with a 
flat web top and bottom.  The hour lines are etched on the vertical member.  
The top flat web creates a shadow along the full length of the vertical web.  
The sundial is adjusted to be perpendicular to the sun at the time of 
reading.   You locate the time at the intersection of the shadow on the proper 
vertical date line.
 
Valentin is such a pleasure to work with.  For instance, he added variations of 
font size to the program so I could laser various sizes of the sundial and 
maintain aspect ratio.  This variation of the vertical cylinder to a flat wall 
seems perfectly made for a laser application.  I love it.

Art Krenzel
 
 

 From: sundial-requ...@uni-koeln.de
 Subject: sundial Digest, Vol 94, Issue 18
 To: sundial@uni-koeln.de
 Date: Sun, 20 Oct 2013 10:19:34 +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
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   sundial-requ...@uni-koeln.de
 
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   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
   (Helmut Sonderegger (Tele2))
 
 
 --
 
 Message: 1
 Date: Sun, 20 Oct 2013 10:19:45 +0200
 From: Helmut Sonderegger (Tele2) h.sondereg...@utanet.at
 To: f.w.m...@rug.nl
 Cc: sundial@uni-koeln.de
 Subject: Re: a unique sundial on a cylindrical column of opal glass
 Message-ID: 52639221.2070...@utanet.at
 Content-Type: text/plain; charset=iso-8859-1; Format=flowed
 
 Dear Frans,
 here a photo of such a Filterhut dial with vertical slits around the 
 edge. This sundial was found some years ago by Manuel Pizarro Gavilan 
 on a column in the couvent of La Baumette near Angers (France). Time is 
 read where the shadow of such a single stick is shortest i.e. vertically 
 down.
 
 On Valentin Hristov's website you find constructions where this edge 
 outside the cylinder is turned inside (with concetric hole in the circle 
 plane on the top of the cylinder): 
 http://www.mysundial.ca/tsp/deltacad_sundial_macros_vh_cylinder2.html. 
 And in these versions finally one can get  Willy Lender's beautiful sundial.
 
 Best wishes
 Helmut
 
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RE: sundial Digest, Vol 94, Issue 12

[Art Krenzel]

 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
 
 
 
 
 
 
 
 
 
 
 
 
 ---
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 -- next part --
 An HTML attachment was scrubbed...
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 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 cylindrical column of opal glass
 Message-ID: 001801cec933$ec09e6b0$c41db410$@comcast.net
 Content-Type: text/plain; charset=iso-8859-1
 
 Hi Willy  others:
 
  
 
 Similar glasses have been made by three others that I know

Sundial finish

[Art Krenzel]

There have been several discussions on the optimum shape of a gnomon to produce 
a good shadow however I have not seen any discussion on the optimum surface 
coating of a sundial yet.
 
From the collective experience of this listserve, what surface (color, 
texture, finish, material, etc) is the best choice to show a gnomon shadow?

Art Krenzel

 












 


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RE: sundial Digest, Vol 85, Issue 11

[Art Krenzel]

Donald, Why limit your website  to show only a sundial in one hemisphere or the 
other? Why not let the person who enters the website determine where he is from 
and what a sundial in their hemisphere works like?  Or see what it might look 
in another hemisphere? You have an opportunity to teach by leaving both of the 
variants of animated sundials on the website and letting the user choose which 
he would like to see.

Art Krenzel 
 
 
 Message: 1
 Date: Sat, 12 Jan 2013 09:34:07 +1000
 From: Donald Christensen dchristensen...@gmail.com
 To: Richard B. Langley l...@unb.ca
 Cc: Sundial Mailing Mailing List sundial@uni-koeln.de
 Subject: Re: Analemmatic sundial
 Message-ID:
   cac+ykpuu6duktdb5ogcgrqjs+8+vbxy3ahycroxggde2g7o...@mail.gmail.com
 Content-Type: text/plain; charset=iso-8859-1
 
 Once I moved to Australia from California, It took me about 3 years before
 I would stop make embarrassing mistakes concerning left from right. At
 times, I felt I was 6 years old again!
 
 I lived in California for 22 years
 The ocean is west
 The sun sets on the ocean
 We drove on the right
 When we face north, our back is to the equator
 
 In Brisbane
 The ocean is east
 The sun sets inland
 We drive on the left
 When we face north, we are also facing the equator
 
 
 I also had a fun time learning about sundials. 95% (or more) of the books
 and articles are for northern hemisphere dials. I had to try to convert
 this data to southern hemisphere before I even knew how a sundial works!
 
 
 I have changed the animation for the shadow to rotate the other direction.
 However, I'm still undecided of which one to use on my website and email
 footer
 
 http://content.screencast.com/users/dchristensen777/folders/Default/media/424ea0f6-012b-4d4f-ac4e-beb931f04403/GIRL_SHADOW%20northern%20dial.gif
 
 Cheers
 Donald
 0423 102 090
 www.sundialsforlearning.com
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Wrist worn competition for sundials

[Art Krenzel]

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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The FIRE WATERFALL, Yosemite National P...

[Art Krenzel]

A spectacular seasonal sundial for your enjoyment.  I hope the photo comes 
through.  If it does not, I will send it to anyone who is interested via email.

Art Krenzel  
A rare sight!! Yosemite National Park, California, USA 

This park was gazetted as a national park in 1890. The park is world 
famous for its rugged terrain, and century-old pine trees. It covers 
1200 sq km and the fire waterfall of El Capitan is one of the most 
spectacular of all scenery. 

The spectacular view of the waterfall is created by the reflection of 
sunlight hitting the falling water at a specific angle. This rare sight 
can only be seen during  a 2-week period towards the end of February. 
To photograph this rare event, photographers would often have to wait 
and endure years of patience in order to capture it. The reason is 
because its appearance depends on a few natural phenomena occurring at 
the same time.


1st, Is the formation of the waterfall - The water is formed by the 
melting of snow and ice at the top of the mountain. It melts between 
the months of December and January so by the end of February there 
might not be much snow left to melt 

2nd, is the specific angle of the sunray hitting the falling water - 
The sun's position must be exactly at a particular spot in the sky. 
This occurs only in the month of February and at the short hours of 
dusk. If it is a day full of clouds you can only take pictures of your 
own sorry faces on the waterfall. It coincides with the fact that the 
weather in the National Park at that time of the year is often volatile 
and unpredictable. It compounds the difficulty of getting these 
pictures. 

Someone did !!! and we all get to see it !!!







 From: limasie...@juno.com
Date: Sun, 19 Feb 2012 17:25:45 +
Subject: 10 gorgeous pictures of FIRE WATERFALL, Yosemite National P... 
To: 



Please note: forwarded message attached






53 Year Old Mom Looks 33
The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried
consumerproducts.com









 

 


  
  
  
  
  
  
  



  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 



A 
rare sight!! Yosemite National Park, California, USA 

This park 
was gazetted as a national park in 1890. The park is world famous for 
its rugged terrain, and century-old pine trees. It covers 1200 sq km 
and 
the fire waterfall of El Capitan is one of the most spectacular of 
all 
scenery. 

The spectacular view of the waterfall is created by the 
reflection of sunlight hitting the falling water at a specific angle. 
This rare sight can only be seen during  a 2-week period towards 
the end of February. To photograph this rare event, photographers would 
often have to wait and endure years of patience in order to capture it. 
The reason is because its appearance depends on a few natural phenomena 
occurring at the same time.

1st, Is the formation of the 
waterfall - The water is formed by the melting of snow and ice at the 
top of the mountain. It melts between the months of December and 
January 
so by the end of February there might not be much snow left to melt 


2nd, is the specific angle of the sunray hitting the falling 
water - The sun's position must be exactly at a particular spot in the 
sky. This occurs only in the month of February and at the short hours 
of 
dusk. If it is a day full of clouds you can only take pictures of your 
own sorry faces on the waterfall. It coincides with the fact that the 
weather in the National Park at that time of the year is often volatile 
and unpredictable. It compounds the difficulty of getting these 
pictures. 

Someone did !!! and we all get to see it !!! 


 

 



 

 


 


  

  


  

  


  

  


  

  


  

  


  

  


  

  
  




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Horsetail falls

[Art Krenzel]

Roger Bailey sent me a URL which might help others see the details of Horsetail 
Falls in Yosemite Park. Thank You Roger! 
http://www.todayandtomorrow.net/2010/03/11/horsetail-firefall/

Art Krenzel
10505 NE 285th Street
Battle Ground, WA 98604
 

 







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RE: sundial Digest, Vol 69, Issue 3

[Art Krenzel]

John, I am currently working on a variation of Valentin's Shepherd's sundial 
which will be an eight inch long, tall webbed I beam out of wood.  To reduce 
the congestion of the dual number scale on the conventional sundial, Valentin 
has changed the program so I can have a morning sundial on one side and the 
afternoon on the other.  I hope to use a sliding copper nodus aperture to show 
the actual time on the sundial face. My laser does not cut metal but I can fuse 
a painted coating on a metal surface with great detail.  When I get farther 
along, I may make one out of metal just for practice. Valentin Hristov's 
program is very easy to use and can make corrections for EOT and Longitude as 
well.  I love it. Thank you Valentin for making it available.

Art Krenzel







  Message: 3
 Date: Thu, 1 Sep 2011 09:36:49 -0700
 From: John Carmichael jlcarmich...@comcast.net
 To: valhr...@bas.bg, sund...@rrz.uni-koeln.de
 Subject: RE: Shepherd's sundial design
 Message-ID: 003d01cc68c5$59189110$0b49b330$@net
 Content-Type: text/plain; charset=us-ascii
 
 Hi Valentin:
 
 My first thought when I saw your photo of The Shepherd's House Dial was
 that it looks just like a cupola! (We don't have many shepherds where I
 live).
 
 I suppose a shepherd's sundial cupola could be built, but rotating it might
 be a problem! A weathervane on top would look cool.
 
 Then again, could also possibly work as a bird house (might freak the birds
 out though when you spin it).
 
 Looks cool as it is though.  Will Art Krenzel be making one of metal?  Art
 is an expert metal worker. 
 
 John 
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Shepherd's sundial design (Valentin Hristov)

[Art Krenzel]

I would like to tell you about the pleasure I had working with Valentin Hristov 
making several varieties of his Shepherd's sundials.   I was amazed at his 
ability to quickly tweak the software to make the sundials much easier to 
fabricate using a laser engraver. I hope you all take the time to evaluate his 
Shepherd's house style sundial program.  I have constructed several versions 
of his great sundial idea and love all of them. Thank you for sharing your 
great sundial idea with this group, Valentin.  Your work is outstanding!
Art Krenzel, P.E.
PHOENIX TECHNOLOGIES
10505 NE 285th Street
Battle Ground, WA 98604  
 
 Today's Topics:
 
1. Shepherd's sundial design (Valentin Hristov)
 
 Dear sundial friends,
 
 In the beginning of August I shared with Art Krenzel the idea for an
 interesting design of Shepherd's sundial and he encouraged me to make it
 public.
 
 Attached is a picture of SH (Shepherd's House). The model is made by
 using the normal paper for laser printer. Therefore the vertical walls
 are not completely flat. If you use wood to make such a model, then the
 accuracy of reading the time would be much better.
 
 I like to include the EOT and Longitude corrections in my sundials and
 therefore the walls contain the four combinations of the two options for
 the period of the year (Jan-Jun and Jul-Dec) with the two options for
 the day period (morning and afternoon).
 
 Perhaps the chimney is a very important part of the dial :-). It allows
 an easy rotation (by one hand!) in order to orient the Shepherd's House
 properly. The user has simply to hide the side shadows of the vertical
 edges of the corresponding wall and then the wall is perpendicular to
 the sun direction!
 
 I hope you will like this design.
 
 More sunny days!
 
 Valentin Hristov
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RE: sundial Digest, Vol 68, Issue 24

[Art Krenzel]

Karon, I am going to stand up in the face of all the proof the list has offered 
that glass does not flow.  As a working Chemical Engineer, I can tell you that 
the properties of glass depend upon the raw materials and the process used to 
make it.  In the approximate 5000 years of glass production, some small glass 
manufacturer somewhere might have used some weird ingredient thinking it 
might enhance the overall quality or provide some new feature in the glass.  
This glass was installed in some location where it was observed to be inferior 
and deflected in the mounting.  One absolute I can offer is that the formula 
for glass and the fabrication process has not been a constant over the 5000 
year history of glass. To begin an urban legend, all that is required is one 
off-hand observation by an unqualified observer and 5000 years of history is 
stained (pardon the pun),

Art Krenzel   
 You would know this but most people don?t. glass is always a little bit 
 liquid. Very old windows are slightly wider at the bottom than the top 
 because the glass continues to flow over the years.  Of course, that is not 
 from experience working with glass, so you may debunk me, here, but it is 
 something I read about in books about Vintage Homes back when I sold houses.
 Karon Adams
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Re: Glass on Glass Mosaic Indoor Sundial Windows

[Art Krenzel]

John,
 
As you adventure to ever more powerful magnets, I would like to share my magnet 
experiences with you.  I have used the ultra powerful Neodymium magnets in my 
work in determining the exit times of military high speed cannon projectiles 
for several years now.
 
I have enough blood blisters from having these magnets snap together by 
inadvertently holding them within an inch of each other.  They will shatter 
each other if allowed to impact one against another.  This impact force would 
be sufficient to shatter the glass being used as the support structure for the 
sundial if not carefully applied.  This could ruin many manhours of work if the 
supporting glass structure is broken.
 
Neodymium magnets are in a world all onto their own.
 
Art Krenzel
45.828N  122.565W

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Top hat azmuth sundial design

[Art Krenzel]

I have been trying to find an email address which works for Ing. Gianni Ferrari.

 

I am interested in getting a demo copy of the software for the top hatted 
azmuth dial he advertises on his webpage.  He says that Giuseppe Zuccala made a 
software dedicated to the azimuth cylinder
I would like to try it out.

 

Please let me know how I might reach Gianni Ferrari.

 

Thank you!

 

Art Krenzel

45 41.685'N  122 33.9W
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RE: sundial Digest, Vol 45, Issue 22

[ART KRENZEL]

Tony Moss,

 

On a recent posting you said: While walking...wellshuffling 
really...across a Columbia River 
bridge with Larry McDavid before the recent NASS Conference in Portland 
we were brought to a halt by a centre span lifting to allow a ship to 
pass through. In the few minutes pause my attention wandered to the 
structural steelwork which had a lustrous metallic finish which I think 
was the result of 'metal spraying' with a sacrificial zinc alloy 
perhaps? The shadows of my fingers showed up very clearly on the 
'grainy' surface and it occurred to me that this might be a very durable 
finish on a extra-strong steel dial outdoors.
 
Vitae Lampada for that idea I guess.
 
Tony Moss

 

You are living proof that sundialers must be from the DARK SIDE as referenced 
in STAR WARS.

 

Here you are, on one of our few sunny days, making dark shadows on our fine 
bridge.

 

A DARK SIDE event if I ever saw one. 

 

May the FORCE be with you forever Tony!

Art Krenzel

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Vanvcouver Sundial

[ART KRENZEL]

Tom,

 

I guess you could call me the responsible party however the sundial was a 
collaborative effort with Brian Albinson, Roger Bailey, Dick Shamrell and 
myself.

 

Please give me a call and we can discuss the details you are interested in.

 

I am making a presentation at the NASS Meeting in Portland in Aug 09 on how we 
took the aluminum billets and made a 3 D gnomon out of them.  It is a riveting 
expose, be there!  :-)

Art Krenzel, P.E.
PHOENIX TECHNOLOGIES
10505 NE 285th Street
Battle Ground, WA 98604
360-666-1883 voice
phoenix98...@msn.com
 


Hi there,
 
I am a new member to this list and I would like to find a knowledgable
member in the Portland, Or - Vancouver, WA area who would be willing to talk
with me about sundials.
 
Tom Laidlaw


 

 

 
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3D analemma design

[Art Krenzel]

Thanks to the wonderful members of the Sundials listserve, we were able to 
solve the design issues for a 3 dimensional gnomon over the weekend.

Special thanks to Brian Albinson, Roger Bailey, Carl Sabanski, Simon 
Wheaton-Smith, Alan Clark, Werner Riegler and David Brown for their doggedness.

It is wonderful to belong to a listserve with such enthusiastic, giving 
members!  

Thanks again Gang!

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

3D analemma

[Art Krenzel]

I am seeking some assistance to construct a 3 dimensional analemma to be used 
on a gnomon of an equatorial sundial.  Specifically I am seeking an equation 
which can be used to plot the analemmic error information in X and Y such that 
I might enter the data into a CNC machine to cut the curved surfaces.  I want 
to average the time errors from each side of the figure 8 layout to make a 
symmetrical 3 dimensional object.

Does anyone have a formula to plot analemmic timing errors where I can enter a 
value for X (not days) and get a timing error as Y for graphical purposes?

Thank you for any efforts to help me solve my problem.

Sincerely,

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

Re: sundial Digest, Vol 27, Issue 19

[Art Krenzel]

Chris,

I would think that you might consider using a colored graphic over the face 
of the sundial (under the sundial lines) which would indicated the daily 
energy from the sun at that hour just using color.  You might also do it 
with a three D graphic but that would be more difficult.

Art Krenzel
45.828 N, 122.56W


 Chris Lusby Taylor [EMAIL PROTECTED]
 Subject: Re: Welcome to summer; sundial display of seasons
 To: Hein [EMAIL PROTECTED], 'Ricardo Cernic'
 [EMAIL PROTECTED], 'lesliel' [EMAIL PROTECTED]
 Cc: 'sundial' [EMAIL PROTECTED]
 Message-ID: [EMAIL PROTECTED]
 Content-Type: text/plain; charset=iso-8859-1

 Hein [EMAIL PROTECTED] added the thought that:

 I like the longer daylight too. So I look up for the 30 of march, when
 daylight saving time (summertime) is beginning.
 Hein van Winkel
 52 08 56 N  4 45 53E

 ..which reopens another can of worms, which I don't propose to deal with.

 But my daughter, just back from Singapore, was delighted to see snow this
 morning. She hadn't seen it for years. So much for my claim that it is now
 summer!

 I have been asked by the Meteorological Office to advise on a sundial
 design, to go on their educational Web site, suitable for children to 
 make.
 I've been trying to think how to show children about seasons through the
 sun's movement. Clearly, a sundial can show you how the sun's altitude and
 the length of day vary. Also, the amount of energy received from the sun
 instantaneously/daily. Does anyone have any thoughts on how best to do 
 this,
 or indeed other aspects of seasonality that a sundial can demonstrate? I'd
 like to make it as relevant as possible to meteorology.

 Regards
 Chris Lusby Taylor
 51.4N 1.3W

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Re: sundial Digest, Vol 23, Issue 17

[Art Krenzel]

Dear Willy Leenders,

Thank you for introducing us to such a great sundial site.

As a very new sundialist I was especially appreciative of the variety of 
sundials presented and the creativity of their designers.  I do not speak 
Dutch so I was only able to appreciate the mechanics but had no feel for the 
soul or history of the dials.

Thank you again!

Art Krenzel



 Message: 1
 Date: Wed, 21 Nov 2007 14:05:24 +0100
 From: Willy Leenders [EMAIL PROTECTED]
 Subject: a new sundial website
 To: Sundial List [EMAIL PROTECTED]
 Message-ID: [EMAIL PROTECTED]
 Content-Type: text/plain; charset=iso-8859-1


 There is a new sundial website: the sundials of the province of
 Limburg (about 100 sundials)

 Limburg is the easternmost province of Flanders (which is one of the
 three regions of Belgium). It contains 44 municipalities and has
 820.000 inhabitants. As in all Flemish provinces, the official
 language is Dutch.

 The most important place in the province concerning sundials is the
 Sundial Park in Genk, a permanent sundial exhibition at an
 international level.
 The latitude, sufficiently accurate for the construction of sundials
 anywhere in the province, is 51? N.

 The sundials are classified by municipality and by type. There is a
 description of each sundial.
 The site is illustrated with 200 photographes.
 Under the heading 'wijzerweetjes'  simple worth knowing information
 concerning sundials is available.

 The language of the site is Dutch. For those who do'nt understand
 this language a visit to the site is recommondable because of the
 structure of the site and the photographes.

 The adress is: http://www.wijzerweb.be/

 Willy LEENDERS
 Hasselt Flanders (Belgium)

 www.wijzerweb.be
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My recent message on Ft Vancouver sundials

[Art Krenzel]

I apologize for sending a message which exceeded your 50 kb message limit.  I 
was unaware of this limit when I attached the photos.

I would gladly forward the photographs directly to interested parties by email 
if that would work better.

Thank you for your help.

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

Shipboard sundial

[Art Krenzel]

Fer,

Thank you for including the photos of the shipboard sundial.

That appears to be quite a well made, precision instrument for it to be a toy 
for the passengers to play with.   :-)

It was a far better instrument than I expected when this question was posed to 
the sundial group.

Are there other sundials out there with such precision dials, etc?

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

New Project 2

[Art Krenzel]

Members of NASS,

Thank you very much for your wide range of caring responses to my request for 
information.  You are a very close organization as evidenced by your rapid 
responses.

I have spoken with several of you on the phone to confirm additional 
information and in all cases your knowledge and enthusiasm for sundials was 
infectious.

Per your recommendations, I have joined NASS this evening and am looking 
forward to reviewing earlier knowledge on your CD.

I would look forward to further responses to my earlier request for information 
regarding our 100 Sundials Project.

Thank all of you early birds for your sage information regarding sundials, 
projects, pitfalls, concepts, etc.  You all belong to a wonderful group of 
people willing to help each other.  I am very impressed with the fine quality 
of all whom I have contacted so far and look forward to meeting others in the 
group.

Sincerely,

Art Krenzel, P.E.
PHOENIX TECHNOLOGIES
10505 NE 285th Street
Battle Ground, WA 98604
360-666-1883  voice
[EMAIL PROTECTED]

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