Hello Frans,
You can view Thew's patent at
http://www.uspto.gov/patft/index.html
just type in the patent number - 2931102.
Fred Sawyer's article(s) in Compendium 1-2 re Thew's dial may
interest you. Perhaps you've already reread them.
Best wishes,
Mac
Hi all,
Last year I bought a garden sundial of a type which I call an "inverted
armillary sphere"; see my web page:
http://www.biol.rug.nl/maes/zonnewijzers/en/whitehall-e.htm .
This model is being sold in stores for garden ornaments, also on the web. A
company named Whitehall may be the whole-seller or manufacturer. In my page,
I trace the model back to Robert Adzema & Mablen Jones's "Great Sundial
Cutout Book".
Recently, I found a picture of the garden dial on the NASS website:
http://sundials.org/faq/types/othertypes.htm,
where it was called a "Thew patent dial". The patent dates from 1960. The
patents section of the NASS Repository cd-rom does not go back that far. The
Cutout book does not give any reference for the source of this dial type;
that's why I interpreted it as being Adzema & Jones's own, novel design.
My question is: Does anybody know what the Thew patent covers? And what is
the relationship between the designs by Thew - Adzema & Jones - Whitehall?
Kind regards,
Frans Maes
53.1N, 6.5E
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