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    Re: What were the Lunar Distances for - two requests to G.Huxtable and one remark
    From: Jan Kalivoda
    Date: 2002 Dec 29, 12:53 +0100

    Thank you very much for your quick answer, Mr. Huxtable. It was very useful. 
    You have deciphered my e-mail address well.
    
    Please, can you send me your reply once more to my e-mail address? I haven't 
    obtained it from the list - maybe the server was not accustomed to me in the 
    first hours of my presence. The reaction of Jared Sherman reached me already.
    
    And another request and probably more demanding one - you have mentioned in 
    the past weeks that you had collected a list of printing errors in Cotter's 
    "History of Nautical Astronomy", and you offered it to the list members. Can 
    I ask for it, if it is not difficult for you? Thank you very much. In my 
    opinion, Cotter's treatment of very popular Dunthorne's method for clearing 
    L.D. isn't correct, among other things.
    
    Upon second thought, I suppose that there must have been an important turning 
    point in the history of relations of L.D. and chronometer - the introduction 
    of the temperature corrections for the chronometr rates. Lecky speaks of them 
    as of a rather new concept in his "Wrinkles" from 1881, so they might have 
    been commonly introduced in 1870 or so. (I am waiting for Gould's book on the 
    history of chronometer via interlibrary services.) After that, the 
    chronometer time may have been correct within twelve seconds even after 
    several months offshore without any check - provided that no mechanical 
    failure took place. L.D. could only discover such potential failure then, not 
    more.
    
    But before, even the best chronometer in the best condition could deviate for 
    one minute during one month of great temperature differences to the 
    temperature, for which its standard rate had been established. After two 
    months of deep-sea navigation, chronometer and L.D. became equivalent in 
    their reliability.
    
    
    Jan Kalivoda
    
    
    

       
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