NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: My Kollsman sextant.
From: Paul Hirose
Date: 2021 Jun 19, 13:56 -0700
From: Paul Hirose
Date: 2021 Jun 19, 13:56 -0700
On 2021-06-19 10:00, David Pike wrote: > Have > you worked out how to make a bubble yet? That can be fun. I have the sextant instructions from US Air Force Manual 51-40 online. It does NOT include the electronic averager. http://sofajpl.com/airnav/index.html#PERISCOPIC They describe how to form the bubble. Also see the section on collimation (the correct sight picture) near the end of the page. This is common to all bubble sextants. The periscopic sextant is quite usable when hand held. Though much heavier than a marine sextant, its shape and the location of the altitude knob are such that you can hold the sextant with both hands while your elbows are braced against your chest. A 2-minute observation with the averager is feasible, though the coordination and sustained concentration to maintain collimation is quite something — very different from a marine sextant. But that just adds to the fun. -- Paul Hirose http://sofajpl.com/
