NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Small zenith distance: a "bubble" sextant vs a Newtonian type sextant?
From: Tony Oz
Date: 2018 Feb 28, 02:18 -0800
From: Tony Oz
Date: 2018 Feb 28, 02:18 -0800
Frank, you asked if I tried to handle a bubble sextant - no, I do not have experience with any of them. I thought if I put the bubble into the very center of the bubble-chamber (as I saw on the pictures - often marked by special lines/circles) - I am guaranteed to make it perfectly vertical. Is that a wrong impression?
My experience with a "marine" sextant proves it is tricky to have it precisely vertical - often there are no means (like a horizon prism etc) to check the instrument position.
I see a piece of IMS-3 (a soviet-made integrating bubble-sextant) on sale (rather cheap) so I definitely will try to buy it.
Regards,
Tony
