NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2014 Jan 23, 18:55 -0500
Hi Don
After many hours of searching via Google for "greatest angle" & etc, I am forced to abandon the search in the way I'm doing it.
However, there are only about 6500 UK patents until the year 1900 (based on other returns). Perhaps now its time for an exhaustive search, with just a glance at the patent drawing for each. Since the drawing will of necessity include a sextant, this should be fairly rapid. The assumption is that there is a way to look at them that way.
Brad
Brad wrote:
I don't know how you are getting the UK Patent reprints. Perhaps you can show us how. Until then....This patent: Apparatus for testing the centering of divided arcs of circles
United Kingdom Patent 316438-A is a valuable device that uses prisms to let a navigator (not a calibration house) test his arc. Its what Frank and Alex were briefly chatting about 7 years ago.
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No big secret. I used the European Patent Office search engine, espace.netHere is the patent you seek:
On the left side, click on Original Document to view and download.
Now I challenge you to find that mysterious patent for that 1st generation Greatest Angle Clamp.
Don Seltzer
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