A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Norm Goldblatt
Date: 2015 Oct 3, 12:41 -0700
Fiendishly clever. And notice how spindley the mount is. That's because vertical angle of periscope is immaterial and horizontal alignment would just image the horizon at 180+/-! Don't ya love it? I think this was mentioned in a previous post. This embodiment looks like 2 right angle prisms rather than a pentaprism. Much lighter and cheaper. But, if I were he, I'd take off my hat.