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    Re: Eight day aircraft clock
    From: Greg Rudzinski
    Date: 2015 May 5, 07:24 -0700

    Sam,

    Aircraft clocks are not chronometers yet very well made and accurate.  The pair that you have can be ajusted where you see the F  S  (fast/slow) on the back of the movement. With some patience these clocks can be adjusted to rates of less than +/- 10 seconds per day when kept at constant temperature and orientation. John S. Letcher discusses the 8 day aircraft clock as a substitute for a marine chronometer in his book Self Contained Celestial Navigation.

    http://www.amazon.com/Self-contained-Celestial-Navigation-HO-208/dp/0877420823

    Greg Rudzinski

    From: Samuel L
    Date: 2015 May 5, 03:32 -0700

    Greg,

    During WW II my father got 2 cockpit clocks from downed German Messershmitts. Would these be an 8-day clock or at most chronometers? The run fine but I've never attempted to "rate" them myself.

    You can see a picture of the clock at the top of the page in link listed below;

    http://www.cockpitclock.com/JUNGHANS.html

    Sam

     

     

       
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