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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Butterfly Bris Prototype
From: Greg Rudzinski
Date: 2009 Jun 18, 15:08 -0700
From: Greg Rudzinski
Date: 2009 Jun 18, 15:08 -0700
Hewitt, 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. Greg On Jun 18, 2:04�pm, Hewitt Schlerethwrote: > 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. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---