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    Book about Plath.
    From: George Huxtable
    Date: 2006 Oct 12, 23:16 +0100

    I wonder if anyone has a copy of, or has easy access to, "From sextant
    to satellite navigation", by Friedrich Jerchow, which was published in
    1987, in English and in German?
    The question that I am trying to resolve was asked a long time ago on
    the old Nav-l mailing list and still awaits a proper answer. It is
    this: "When, and by whom, was the first true micrometer sextant
    Jean Randier, in "Marine Navigation Instruments", of which I have the
    1980 English edition, shows on page 119 a page from a Plath catalogue.
    This illustrates a quintant, a wider version of the sextant, used
    particularly by hydrographers, described as "Vermessungsquintant mit
    Trommelablesung". This undoubtedly has all the vital characteristics
    of a modern micrometer sextant.
    Below it on the page is a "Loth-sextant", which appears to show the
    standard Vernier (= nonius) instrument of the time. So it appears that
    the catalogue is at a transition-date, between the two technologies.
    The question at issue is the date of that catalogue. Randier describes
    it as "published about 1902", but that is irritatingly indefinite; to
    me, that catalogue doesn't look as though it had such an early date.
    So that leaves the date of the introduction of the Plath micrometer
    quintant still somewhat open. I wonder if the Jerchow book referred to
    above, which I think was published by Plath, offers any clues about
    that date?
    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.
    To post to this group, send email to NavList@fer3.com
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