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    Re: Butterfly Bris Prototype
    From: Hewitt Schlereth
    Date: 2009 Jun 18, 17:04 -0400

    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 
    >  >
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