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    Bris sextant
    From: John Rae
    Date: 2005 Nov 4, 10:52 -0800
    Thanks for the photographs.  I am now ready to make a test rig Mark 2, and try it out  (after the rains!).  Then I can make a finished instrument.
     
    I have reviewed your calculations re the light path, and have made sketches of each of the possible light paths.  I also created a spread sheet in Lotus 123 (I'm not up to the Microsoft age yet) to calculate all of the maths, including light loss with assumed % light reflection.  After I have completed all of this, I will let you know the results, but don't hold your breath for an early reply.
     
    Thanks,     John
       
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