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    Re: Variants of the Bris
    From: Greg Rudzinski
    Date: 2009 Jun 25, 21:05 -0700

    I have abandoned the sunglass attachment concept. The distortions were
    unacceptable. The clean edge of the slide along the opposing slides
    flat surface and squaring everything up by eye is the best that I can
    do in the perpendicularity department. A jig can be made to do a
    better job of squaring up but for now being a little off plane will
    have to do. Jockeying the Bris about seems to find the low point for
    calibration and subsequent  observations.
    On Jun 25, 8:13�pm,  wrote:
    > Greg, in your Bris sextants and variants, what do you do to make sure that 
    the reflective glass pieces are perpendicular to a common plane?
    > And do you find that you can "swing the arc" properly when the Bris sextant 
    is attached to a pair of sunglasses? I'm getting an entertaining image of 
    your head bobbing about. :-)
    > -FER
    Navigation List archive: www.fer3.com/arc
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