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    Re: Star-star distances for arc error
    From: James N Wilson
    Date: 2009 Jun 26, 17:42 -0700

    I don't like verniers in conjunction with a micrometer drum, since I've
    seen too many sights ruined by reading the wrong end of the vernier as
    the index. I offer my students a diagram to help them analyze their sight
    plots, and if a measurement is nine minutes above where it should be,
    that's due to reading the wrong end of the vernier.
    
    As noted, readings to 0.1' can be done without a vernier, so why have
    one?
    
    Jim Wilson
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