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Frank,

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.

Greg

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
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