Wappen

[Fred Jaggi]

I have a Swiss family wappen (coat of arms ) which I would like to include
in a sundial. I'm not an artist so I would like to see some examples of
coats of arms included in sundials. Does anyone know of any
Fred Jaggi

-

re: dividing the circle

[Fred Jaggi]

There's an excellend discussion and description of 
a measuring instrument made by the Moore Special Tool co. which is accurate to 
0.1 second of arc. See the book: "Foundations of 
Mechanical Accuracy" by Wayne C. Moore published by the company in Bridgeport 
CT. in 1970. See:
http://www.thomasregister.com/olc/44626000/publicat.htmand 

http://www.thomasregister.com/olc/44626000/1440.htm
The index and dividing tables are still 
made

Moore made wonderful measuring machines built 
by hand scraping could measure anything in an approximate volume of 1' by 
l'-6"byl'-6" to an accuracy of 25 millionths of an inch. The book 
described in beautiful detail how the measuring machines were made.

These days this type of measurement is done by 
laser and the measuring machines are much simpler. See for example:
http://www.brownandsharpe.com/

Fred Jaggi

Re: duomo di Milano

[Fred Jaggi]

The book  The sun in the church Cathedrals as solar observatories by Dr.
J. L. Heilbron is available from half.com for only $9.95. Excellent value
for the technical and historical background to the meridians in the medieval
cathedrals.
http://half.ebay.com/search/search.jsp?nthTime=1product=bookskeyword=the+sun+in+the+churchx=13y=17
Fred Jaggi

-

Re: duomo di Milano

[Fred Jaggi]

There is an excellent book by J. L. Heilbron published by Harvard University
Press in 1999 titled: The Sun in the Church - Cathedrals as Solar
Observatories That gives a very full description of  Meridian lines in
Cathedrals, their location and the technical and historical background.

Fred Jaggi
- Original Message - 
From: heiner thiessen [EMAIL PROTECTED]
To: Sundials Mail List sundial@rrz.uni-koeln.de
Sent: Thursday, July 03, 2003 3:32 PM
Subject: duomo di Milano


 Many yers ago I witnessed in the
 cathedral of Milan the spectacle of
 a small circle of light, projected by a ray of
 sunshine onto the marble floor and
 travelling at some considerable speed across
 the vast floor space.
 I suppose this would have been a meridian dial
 but I was not into dialling at the time and failed to ask
 all the right questions.
 Is there anybody out there who knows about
 this dial in the cathedral of Milan?
 I also understand there are several of these in Italy and
 one in the Hagia Sofia in Istanbul.
 Who has knowledge about the Hagia Sofia one?
 Are there any in the UK?

 Heiner Thiessen
 51N
 01W


 -

-

re: duomo di Milano

[Fred Jaggi]

If I read Heilbron's book correctly, pages 266 to 272, the meridiane was
designed by Giovanni Angelo Cesaris in the 1780's. His superiors wanted to
be able to fix the time of noon and supress the old custom of telling time
by Italian hours which depended on the time of sunset, and the length of the
day.
Fred Jaggi

-