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Red knob on micrometer
From: Frank Reed
Date: 2014 Jun 22, 19:53 -0700
From: Frank Reed
Date: 2014 Jun 22, 19:53 -0700
A few months ago, someone asked me what the "red knob" on the micrometer on his sextant was for (see the image below). I have finally remembered to post this. Is it used to adjust out index error or something like that? That was my quick guess.
-FER
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