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    Instrument Corrections
    From: Fred Hebard
    Date: 2003 Mar 7, 21:26 -0500

    The calibration label on the inside of my Husun sextant box says:
      The following corrections should be applied:
    Angle        30d   60d   90d  120d
    Correction   +20"  +10"  +30"  +30"
    After reading Bowdich and Bauer, I concluded that I should _subtract_,
    for instance, 30 seconds of arc from a measurements of 90 degrees.  But
    I'm wondering whether I shouldn't be adding 30 seconds of arc rather
    than subtracting it, for readings of 90 degrees.
    Any comments would be very much appreciated.
    Thanks in advance,
    Fred Hebard

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