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    Worsley's Chronometer(s)?
    From: Brad Morris
    Date: 2009 Feb 24, 14:21 -0800

    Gentlemen
    
    I went back and present herein the two chronometers which claim to be the one 
    used by Worsley.  Obviously, they both can't be right.
    
    This one is from the National Maritime Museum in Greenwich, England and is a 
    Thomas Mercer boxed, gimbaled chronometer.  
    http://www.nmm.ac.uk/server/show/conMediaFile.2279
    
    This one is from the James Caird Society, a pocket watch  type chronometer 
    http://www.jamescairdsociety.com/shackleton-news.php?id=102901  
    
    The James Caird Society article also contains an image of Worsley using the 
    sextant without an artificial horizon to check his location, while trapped in 
    the ice.  The US Navy published a book in the early 1950's called "Naval 
    Arctic Operations Handbook" in which they indicate that this practice is 
    feasible if you estimate the height of the ice around you and use that as 
    your 'sea level'.  Then the height of your eye above the height of the ice 
    around you will yield the correction for dip.
    
    Best Regards
    Brad
    
    
    
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