NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Bubble sextant construction
From: Randall Morrow
Date: 2013 Mar 21, 14:38 -0700
From: Randall Morrow
Date: 2013 Mar 21, 14:38 -0700
Can antone tell me how the older sextants change bubble size? Was it with application of pressure or by addding-subtracting volume of fluid? Some old drawing I have seen suggest a bellows for pressure. Also, how much of a difference in accuracy is gained by matching bubble size to the body observed? If it is significant, why do the post WWII versions not have bubble adjustments?
Thanks.
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