A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Eric van der Veen
Date: 2021 Jul 9, 01:45 -0700
My understanding is that the ball recording types were very rare and significantly inaccurate. The only type to have a paper recording that springs to mind is the Fairchild A-10 bubble sextant. This is widely used and common sextant.
They are regularly on Ebay, but mostly not in working order and in need of restoration.