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Greg -

I've been wanting to try one of these for some time. Are there any
detailed instructions around? Is there a mail-order source for the
materials?  (Edmund Scientific, perhaps?)

Thanks. -Hewitt

On 6/18/09, Greg Rudzinski  wrote:
> The Butterfly Bris is a double simplified fixed angle whole horizon mini 
sextant that provides two bright primary sun images and two dim secondary sun 
images. A pair of Butterflies can fit in a 35mm film case just as the 
original Bris can. I have selected a double waterproof 35mm film case which 
holds the pair of Butterflies in one side and a folded 8"x11" photocopy of 
the Pub.249 sun perpetual almanac and sight reduction formulas in the other 
side.
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