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    Re: Sextant calibration. Re: Coordinates on Cook's maps
    From: Alexandre Eremenko
    Date: 2007 Apr 20, 20:15 -0400

    
    George,
    
    > I can't read anything without doing
    > my best to probe it for
    > errors, or pick holes in its arguments.
    > It's a negative, and rather
    > destructive, trait,
    
    Not always. As I said this makes a perfect referee.
    My professional duties include refereeing papers
    for math journals, as well exam grading
    and reading my student's research papers.
    Tnd this sort of activity also
    developed in me the same trait. Whatever I read I always
    automatically mark all mistakes or misprints on the margins,
    even if this is fiction:-)
    
    > I mean, that the Cassens-Plath was divided into
    > sixths of an arc-minute, and the SNO-T into fifths.
    
    No. Nobody divides to 6-ths nowadays,
    because seconds are not used. All use the tenths of
    a minute, including the almanac.
    Cassens-Plath is
    divided to
    fifths or tenths
    and in SNO-T the minutes are not divided at all.
    all.
    Like on many C. Plaths of 1950-s.
    The smallest markings are 1'.
    But the distance between the markings is so large that
    it is easy to interpolate even with naked eye to 0.1'
    In addition there is a microscope on SNO-T
    (a unique feature for drum sextants, as I understand).
    
    Alex.
    
    
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