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    Re: Sextant calibration. Re: Coordinates on Cook's maps
    From: Alexandre Eremenko
    Date: 2007 Apr 20, 17:33 -0700

    George,
    
    On Apr 20, 7:12 pm, "George Huxtable" 
    wrote:
    
    >  I don't regard that
    > zero deviation as rendering the instrument any more precise than another
    > calibrated instrument which has non-zero deviations, as long as the
    > navigator, when doing precise work, takes heed of those deviations pasted
    > into the box.
    
    A zero-certificate, especially one produced by a reputable independent
    agency like Kew, is an evidence of high quality workmanship.
    Lecky, when he gives advise how to buy a sextant says
    this (I cite by memory): go to the Kew observatory, they usually have
    many
    sextants of various brands tested at any time, and look which are the
    quality brands.
    Seems very reasonable to me.
    
    I add that I've never seen a British sextant of 1940 or later with
    zero
    certificate. In fact the only modern sextants WITH a certificate
    showing all zeros
    I've seen on e-bay are Tamayas and even these are rare.
    By "modern" I mean after 1940.
    
    Alex.
    
    
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