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    Re: How Many Chronometers?
    From: Michael Dorl
    Date: 2009 Sep 20, 16:43 -0500

    
    > 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."
    Modern technology has not eliminated the need for such strategies.  Some
    years ago, I heard four young women talk about a winter dog sled trip
    starting in Winnipeg, going through Great Bear and Great Slave Lakes,
    East to Hudson Bay and then South ending at Churchill.  They said they
    had to keep their GPS units warm inside their clothes except for brief
    looks otherwise the LCD screens would not function.  As I remember the
    high temperature for the first month of their trip was -30F.  They did
    stop in native villages and were air supplied.  One big problem was
    transferring gasoline from tins to stoves as a few drops on skin meant
    instant frost bite.
    
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