A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Murray Buckman
Date: 2023 Sep 19, 12:34 -0700
I don't think Captain Onedin has his scope in back-to-front at all. I think it is a glass-free sight-tube for teaching purposes (or for finding a star on a rough day to get the estant arm in about the right place).
Looking at the screen-shots I don't see a lens in there. It would have been quite appropriate to teach use of the sextant with a sight-tube first, before moving to a 3x scope for sun sights.
The Onedin Line introduced me to Aram Khachaturian's Adagio from Spartacus (the theme music for the series). I still love it.