NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
"Lost Motion" Question
From: Greg R_
Date: 2006 Jul 17, 13:20 -0500
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From: Greg R_
Date: 2006 Jul 17, 13:20 -0500
Sort of an off-the-wall question that occurred to
me this past weekend while doing practice sights... I've read (and always
practiced) that because of possible mechanical backlash in the micrometer screw
mechanism you should do your final altitude adjustment in the same direction
(i.e. either bringing the body up or down, not back and forth).
But wouldn't any backlash (i.e. any lag in the
body moving up or down when turning the micrometer dial in the opposite
direction) be immediately apparent to the person taking the sight? Both of mine seem to start moving immediately when I
do that, but maybe there really is some subtle lost motion happening there that
isn't obvious to the observer?
I'll try to remember next time I'm out at the
beach to take a series of sights using both methods (racking in one direction
vs. up and down to find the horizon "kiss") and see what the results look
like.
--
GregR
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