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    Re: Butterfly Bris Prototype
    From: Greg Rudzinski
    Date: 2009 Jun 18, 15:08 -0700

    The Bris Mini Sextant is no longer made. Once in awhile one will pop
    up on Ebay. I make mine from microscope slides using a standard glass
    cutter. I made a pair of Butterfly Bris in an hour and a half. If you
    are handy then try and make one. I'll give you one of my home made
    ones if you contact me off list with a mailing address.
    On Jun 18, 2:04�pm, Hewitt Schlereth  wrote:
    > 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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