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    Re: mechanical chronometers
    From: Alexandre Eremenko
    Date: 2006 May 15, 20:18 -0500


    To get an idea of what a chronometer is,
    go to e-bay and type "marine chronometer"
    in search. Ignore all wristwatches that are
    called chronometers: they just usurped the name:-)
    Also ignore "ships clocks" and "deck clocks" which are
    sometimes listed in this category.
    It is a clock, suspended on gimballs
    ("Cardan suspension") in a wooden box.
    Approximately 10 by 10 by 10 inches.
    The design almost did not change since the middle of XIX century.
    The average chronometer "goes" about a second per day,
    and the best ones about 0.2 of a second.
    "Going" of a chronometer is the technical term which describes
    non-uniformity of its rate.

    Alex

    On Mon, 15 May 2006, Red wrote:

    >
    >
    > Geoffrey-
    >  "It must be understood that a chronometer is not a "clock"."
    >
    > I'm afraid I only know the modern use of the term, i.e. that a wristwatch having
    > passed certain ratings is now "certified" as a chronometer, as Rolex does. Can
    > you tell me what makes a chronometer not just a clock, in the larger sense? And
    > what accuracy you expect from a true chronometer?
    >
    >
    > >


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