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    Re: Centring Error Detector
    From: Don Seltzer
    Date: 2014 Jan 21, 20:13 -0800

    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.
    No big secret. I used the European Patent Office search engine, espace.net

    Here 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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