NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Chasing tenths of an arc minute
From: Frank Reed
Date: 2010 Mar 13, 12:05 -0800
From: Frank Reed
Date: 2010 Mar 13, 12:05 -0800
Bill Morris, you wrote:
"A mid-nineteenth century writer wrote about allowing a little while for the movement of the vernier sextant index arm to settle before reading it."
Sounds backwards to me! If there's any stress stored up in the screw etc., when it's released it's going to shift the index arm and the mirror, too, away from the positions they had when the observation was taken.
-FER
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