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    Re: How Many Chronometers?
    From: Brad Morris
    Date: 2009 May 6, 16:57 -0400

    Hi Jim
    
    True, it is a clock with a known rate, but the rate can change! Let us assume 
    for a moment a mechanical chronometer.  As the lubrication ages, the rate 
    changes.  In the literature, you can see instances of a sea rate and a land 
    rate.  Temperature can also affect the rate.  For an electronic (quartz) 
    chronometer, a very run down battery will have a slowing rate.
    
    For any of these items, how would you know the rate was changing?  Greg 
    suggested comparison to other chronometers.  Henry and I have suggested 
    celestial observations with a known longitude.
    
    We can even see Worsley and Shackleton, attempting to correct their 
    chronometers by lunar occultations, when stuck on the ice in the Weddell Sea.
    
    Best Regards
    Brad
    
    
    -----Original Message-----
    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of James N Wilson
    Sent: Wednesday, May 06, 2009 4:39 PM
    To: NavList@fer3.com
    Subject: [NavList 8163] Re: How Many Chronometers?
    
    
    Brad:
    
    I guess I thought that a chronometer was defined as a clock with a
    constant rate of change.
    
    Jim Wilson
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