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    Re: Sextants, vernier and micrometer.
    From: George Huxtable
    Date: 2006 Oct 29, 23:48 -0000

    Jean-Pierre Planas wrote-
    
    | Alex,
    |
    |  Although it is impossible to tell the condition of the arc and
    vernier from the pictures, this item should be close to what I
    understand you are looking for.
    |
    
    http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=130041796288&indexURL=2&photoDisplayType=2#ebayphotohosting
    |  JPP
    
    and I agree. It would be worthwhile asking some dtailed questions
    about the arc.
    
    That Heath Hezzanith instrument and mine (which is badged with a
    different name) are clearly products of the same factory. It appears
    to be somewhat later than mine, in having an endless-tangent screw,
    which is a worthwhile design improvement. It means that you can never
    get to the end-limit of the fine adjustment.
    
    Note that it also has a rising-piece for the telescope, and obviously
    that feature is by no means as rare as it's cracked up to be. The
    frame casting, though having the same three-ring layout, seems to be a
    bit chunkier in cross-section, so perhaps a bit heavier and sturdier.
    
    There are detailed design differences in the attachment of the handle
    and in the eyepiece size of the magnifier, but all in all, the
    similarities are remarkable. Bid prices are silly at present, but not
    for long.
    
    It's exactly the same model that I nearly bought a few months ago,
    which had a damaged arc near the zero-degree end, so you couldn't see
    the divisions just where they met the Vernier, where it's
    all-important that you do see them. Beware, because it could possibly
    be that same sextant, going round once again.
    
    It's up on the UK ebay site, exactly the same as on the French one,
    but with the text in English.
    
    George.
    
    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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