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    Re: How Many Chronometers?
    From: Gary LaPook
    Date: 2009 Sep 20, 12:21 -0700

    George also wrote that:
    
    "Polar explorers, by the way, would carry sledge chronometers: pocket 
    watches, slung round their necks inside their furs, essential for guiding 
    them back to base along the correct longitude. When Shackleton's Endurance 
    went down in the Antartic ice in 1915, the ship's box-chronometers were 
    abandoned with the ship, and from then on the expedition relied on four such 
    pocket-chronometers."
    
    "Sledge chronometers" were the 1915 versions of the "duct tape-belly 
    chronometer." The early explorers had to resort to just slinging their sledge 
    chronometers around their necks because duct tape was not invented until WW 
    2.
    
    gl
    
    Philip wrote:
    > Since it has already been discovered by the list that it is easier to
    > maintain temperatures above ambient, eg. crystal heaters in HF radios,
    > than below, i would suggest a small well insulated box with a
    > thermostatically controlled heater (one or two watts, 12-15v DC?). The
    > Watch could be viewed through a double or triple insulated glass window
    > so as to not disturb the thermal equilibrium.  This would be a nice
    > project not beyond the capabilities of many of us. A couple of LED's to
    > indicate operating temperature and power on and it would be a nice piece
    > of kit to have at the nav station.
    > Philip
    >
    >
    >
    > , 2009-09-20 at 01:40 -0700, Gary LaPook wrote:
    >   
    >> So, if the cabin can't be maintained at around 25ºC then an alternate
    >> way to stabilize the watches can be utilized. Simply buy a small
    >> cooler and put the watches and some ice in it and establish their
    >> rates at this cooler temperature, they should be running slow. 
    >>     
    
    
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