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    Re: Sextants, vernier and micrometer.
    From: George Huxtable
    Date: 2006 Oct 31, 10:13 -0000

    About the sextant arc that Alex pictured at
    Henry Halboth wrote-
    | It looks to me to be a 10 second vernier. Most older
    sextants/octants had
    | either 10 or 15 second reading verniers.
    But I think Henry should look again. It has 5 divisions to each minute
    of the Vernier arc, as I see it, which means that it measures to 12
    seconds, or 0.2 arc-minutes, somewhere between the two values that
    Henry suggested, of either 10 or 15 seconds.
    That has advantages when the arithmetic started to be done in decimals
    of a minute, rather than in seconds. Perhaps it dates the instrument
    to the later days of Vernier sextants.
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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