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    Re: chronometer dials: 12 or 24 hours?
    From: Dan Allen
    Date: 2009 Jan 20, 14:46 -0700


    On Sun, Jan 18, 2009 at 3:45 PM, Paul Hirose <cfuhb-acdgw---.net> wrote:

    Chauvenet (1863) said chronometers should have 24 hour dials, because
    the AM/PM ambiguity of a 12 hour dial made it more difficult to read the
    correct Greenwich time. See the footnote on this page:
    http://books.google.com/books?id=6JlzJHd15vQC&pg=PA56&output=html

    So I got on the web to see if later ones had 24 hour dials. After
    looking some pictures at this site, I guess that wasn't the case, at
    least for the common American chronometers:
    http://www.chronometer.net/

    I have a solar powered watch that has a rotating slide rule outer bezel.  It contains three inner dials, one of which is a 24-hour dial showing GMT/UTC time.  This is a modern watch called the Citizen Blue Angels Skyhawk, made in Japan.  

    Dan

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