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    Re: Chronometers
    From: Alexandre Eremenko
    Date: 2008 Mar 26, 20:33 -0400

    
    Henry,
    Thank you for your interesting information.
    
    > I suppose there might be some argument with respect to
    > methodology if the time between determination of
    > errors was particularly great,
    
    Strangely enough, I do not find any instructions on
    determining the chronometer rate in the navigation
    manuals that I have.
    
    I would imagine the following procedure (before the
    use of radio). While a ship is in a harbor, the correction
    would be determined daily by the time signals
    (gun shots, falling ball). From this the daily rate will
    be derived. And then used until the next harbor with time
    signals.
    
    > daily rate of 1.5 seconds losing. From a practical
    
    Very close to my chronometer: my one is loosing 1.37 sec
    per day so far, and this is constant within a second.
    
    Here is a difficulty by the way: how do I determine
    the correction with say 1/2 second accuracy?
    The chronolmeter clicks and shows every 1/2 second.
    But my electronic watch (and Internet) clicks with
    only 1 second frequency, so errors of comparison are
    sometimes more than 1/2 second.
    
    > point of view, it was customary to request a new
    > chronometer be set slow so that the error be additive
    > -I guess true sailors didn't subtract too well.
    
    That's a very good point!
    Now I know why my chronometer is 1.2 sec slow:-)
    
    By the way the factory certificate I have contains a lot
    of information from which I can infer how they were tested.
    I can post the details if there is interest.
    
    I cannot repeat this test because it involvs
    five 5-days periods
    running under given constant temperature:-)
    
    Alex.
    
    
    
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