Hi Gianni,
Thanks for the link to Gallica.
I followed your advice and was able to view the texts cited: Clavius on the
construction of sundials and Sacrobosco on armillary spheres (Sphaera Mundi).
This is a great example of the power of the internet. All we need to do is ask
the question
Hi Richard,
It seems you have reinvented Piet Hein's helical dial. See the home page of
Egeskov Castle, http://www.egeskov.dk/english/sightseeing/index.htm
and click nr. 25 on the map or in the list below it.
John Moir showed already that the dial does not function well outside the
equinoxes in
An quick and easy way to make a helical dial for demonstration and
experimental purposes is to take a wide strip of dressmaking elastic,
with a whole twist, held on a frame which can be made for example by
bending a wire coathanger. The hours can be marked in ink at equal
intervals while it's
This appeared back in mid-90's in the British Sundial Society journal -
probably it's the same article which F.Maes referred to by J.Moir.
Regards
Alexei Pace
35.8N 14.5E
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Andrew James
Sent: 01 December
Hi Richard,
It seems you have reinvented Piet Hein's helical dial. See the home page of
Egeskov Castle, http://www.egeskov.dk/english/sightseeing/index.htm
and click nr. 25 on the map or in the list below it.
John Moir showed already that the dial does not function well outside the
equinoxes
One of the talks I will be doing at the next NASS conference will be on a
form of this dial that I developed in 1979 - and I've been toying with its
peculiarities ever since.
Date and location of the next conference are not yet final - but we are
negotiating for an August date on the East Coast
Hi Terry:
It's funny you should mention Frank L. Wright because he was an avid
designer of stained glass windows. There's a whole book of his patterns
that are often copied. He had his own style which is now called
southwestern. It looks a lot like a Navajo design with a lot of art deco
Thanks John,
I do Lloyd's use of Art Deco and triangles in his designs, Mackintosh also
did the same, but a little earlier, I like his work as he spanned the Art
Nouveau and Art Deco periods so influentially. There is a very nice
programme running on UK satellite TV at the moment showing a
Dear Fred,
How neat! I hope to hear more on this.
I've come up with a very simplified Equatorial Stab Dial that seems,
so far, to overcome a number of the peculiarities of the dial as well as
being very easy to fabricate. Very little sun here so far to test it. I'll
send you more info
Title: Sundials and atomic clocks
This article
will be of interest to those of you interested in those weird leap
seconds that sometimes get added to our clocks on New Year's Eve due
to the unpredictable changes in the Earth's rotation. Ironically,
amidst discussions of keeping time with the
And, there is a long, popular level article on leap seconds and GPS
(prompted by the recent Motorola GPS receiver problem) in the 22 November
issue of New Scientist now on newsstands.
See also the article GPS and Leap Seconds: Time to Change? which appeared in
my Innovation column in GPS World in
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