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    Re: Cleaning arc of Vernier sextant.
    From: Alexandre Eremenko
    Date: 2006 Oct 28, 18:35 -0400

    I almost completely agree with George in his answer to
    this question:
    > George, once you decided to acquire a metal sextant,
    > why didn't you just go
    > the whole way and purchase a micrometer
    > drum sextant?
    I say "almost" because it is not evident at all to me
    that the drum sextants are "technicaly superior",
    the thing which seems somehow to be accepted in this
    I agree that the drum sextants are easier to use
    (and probably cheaper make, with modern technology)
    However, I it is not evident at all that they are
    superior in accuracy.
    Notice: the drum sextants were introduced when nobody
    was already taking lunars, and when 0'5 accuracy was
    considered sufficient. I suspect that they sacrificed
    extra precision to economy and convenience of use.
    This is only a conjecture, of course.
    But I am also looking for a good 10" vernier sextant,
    essentially for the same reasons as George.
    When I get one, I can test my conjecture:-)
    At this time I own one drum sextant (SNO) and
    a pocket vernier sextant (Troughton and Simms),
    where the tiny scale can be read only to 1'.
    But I am very much satisfied with this little
    Even reading the fine silver scale through the
    magnifying glass is fun:-)
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