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    Bris Sextant
    From: John Rae
    Date: 2005 Oct 31, 13:43 -0800
    Dear Alex
    The dimensions that would be useful to me would allow me to compute the actual physical angles between the small pieces of glass.  By looking sideways at the instrument, ther will be two triangles with the apex at the bottom where all three touch, and two gaps at the top.  If I knew the vertical distance represented by the length of glass, and the gap at the top between the three glasses (two measurements) then I can compute the angles between the glasses, assuming the tangent and sine of small angles is approximately the same. 
    Using this calculated angle (or angles) I can then adjust my test instrument for further trials to simulate the instrument you have.  I thank you for the information.
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