Hi all
I think it can also work with a square section, so it should be easy to
laser-cut.
I also think the holes on the other side of every number may become a
window, with inside frames, to allow a projection with any declination of
the Sun (a bit more complicated)
The problem may be the projection: the ratio between the size of the holes
and the distance of the projection may blur it and it could become
unreadable.
ciao Fabio
Fabio Savian
fabio.sav...@nonvedolora.it
www.nonvedolora.eu
Paderno Dugnano, Milano, Italy
45° 34' 10'' N, 9° 10' 9'' E, GMT+1 (DST +2)
-----Messaggio originale-----
From: Richard Mallett
Sent: Friday, April 24, 2015 10:01 PM
To: Robert Kellogg ; sundial@uni-koeln.de
Subject: Re: A "Digital" Sundial on Instructables
On 24/04/2015 17:00, Robert Kellogg wrote:
Interesting digital dial. I must admit I looked at this design about 20
years ago. The author has one 3D moveable drawing of the completed dial.
If you look closely on the underside of the gnomon, there are cut-outs of
hour numbers that match the obverse side.
Therefore, this sundial works correctly only two days a year (I'm
inferring that the numbers were aligned for the equinox). Pity that such
a beautiful digital dial is nearly useless. Exactly the same problem with
Voshart's digital cube (see
http://gizmodo.com/this-digital-sundial-tracks-the-sun-through-a-laser-cut-1545753402).
This may force me back to the drawing board since I hold US Patent
5,596,5533 Jan 21 1997 "Digital Sundial". (See also Scharstein's US
Patent 5,590,093 Dec 31. 1996 "Digital Sundial". Dan's patent is earlier,
but he had to reference my article in NASS' Compendium). Ahhhh the modern
digital world.
I understand that Apple's digital watches are being delivered to those few
lucky souls today.
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At a time when digital watches are hardly ever seen in the shops.
--
--
Richard Mallett
Eaton Bray, Dunstable
South Beds. UK
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