In the English Wikipedia encyclopedy at http://en.wikipedia.org/wiki/
St_Mark's_Clock I read concerning the St Mark's Clock, housed in the
St Mark's Clocktower, on St Mark's Square in Venice:
"The signs of the zodiac are in anticlockwise order around the inner
zodiac dial: the zodiac wheel rotates clockwise with the hour hand
but slips back slightly with each rotation, so that the hour hand
slowly passes through each zodiac sign in the course of the year."
I think it must be " ..... but slips forward slightly with each
rotation ....." i.e. the zodiac wheel rotates faster than de hour hand.
Is the Wikipedia text wrong?
Willy LEENDERS
Hasselt in Flanders (Belgium)
www.wijzerweb.be
Op 9-apr-08, om 10:56 heeft [EMAIL PROTECTED] het volgende geschreven:
Peter, if you are looking for a true watch with the EoT, there was
one in the Villeret collection. The name was "Equation Marchante
Pure", ref. code C6038-3442-55B, limited edition of 50 items.
The price was really affordable : only 83,960 euro (eighty-three
thousands !).
I don't know if it is still available.
Best wishes.
Gian
---------- Initial Header -----------
From : [EMAIL PROTECTED]
To : "James E. Morrison" [EMAIL PROTECTED]
Cc : [EMAIL PROTECTED]
Date : Wed, 9 Apr 2008 12:01:06 +0930
Subject : Re: Astronomical Clocks
Dear Jim,
Thanks for the reference. I took a copy out of our library
the other day.
Amongst the many other things which were utterly unknown to me
were 18th century
clocks which incorporated Equation of Time 'kidneys' so that they
could read
sundial time! Is the Dialist's Companion the only contemporary
equivalent?
best wishes,
Peter
Quoting "James E. Morrison" <[EMAIL PROTECTED]>:
The best reference on geared astronomical machines, including
monumental
clocks such the Prague clock is:
King, Henry C., "Geared to the Stars", University of Toronto
Press (1978).
(The late professor King also wrote "The History of the Telescope".)
This book has a fairly detailed description of the Prague
gearing, and the
trains for many other astronomical machines.
Best regards,
Jim
James E. Morrison
[EMAIL PROTECTED]
Astrolabe web site at astrolabes.org
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