NavList:

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.net

Here is the patent you seek:

http://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=10&ND=3&adjacent=true&locale=en_EP&FT=D&date=19290801&CC=GB&NR=316438A&KC=A

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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