A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sextant with an umbrella
From: Bill Morris
Date: 2015 Oct 1, 18:53 -0700
I agree with Luc. It's a Blish prism. More details and a patent drawing can be found here: http://sextantbook.com/2012/04/
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