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    Sumner lines
    From: UNK
    Date: 2001 Feb 17, 3:13 PM

    Apropos the current discussions of ex-meridian sights and books on the
    longitude problem...
    
    Can anyone recommend any articles, books, or parts thereof that chronicle
    the gradual change in common practice from separate solutions for latidude
    and longitude to LOP-based methods, first Sumner's, then altitude-intercept
    after Saint Hillaire? Neither _From Sails to Satellites_ nor _The
    Haven-Finding Art_ cover this. All I have been able to gleen is inferences
    from the way the topics are treated in various editions of Bowditch. It
    would seem that the US Navy adopted the new methods early in the 20th
    century, but the merchant marine continued with the old right up to WW-II.
    
     -- Peter
    

       
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