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    Re: CHO-T Manual
    From: Gary LaPook
    Date: 2007 Sep 09, 01:58 -0700

    glapook{at}PACBELL.NET wrote:
    
    Attached is a copy of an english translation of the manual for the
    CHO-T  russian sextant.
    
    Two things of interest. First, there is a luminescent coating around the
    magnifier for reading the scale that can be activated with a flashlight
    and the glow makes it easy to read the sextant in the dark. I never knew
    it was there.
    
    Second, it describes a method of measuring the index error by bringing
    the top and bottom edges of the sun together twice and then the average
    of these readings will give you the index error. For example, assume no
    index error and the semi-diameter is 15'. Bringing the upper limb of the
    reflected image of the sun into conjunction with the lower limb of the
    direct image should give you a reading of minus 30'. Then putting the
    lower limb of the reflected image in conjunction with the upper limb of
    the direct image should read plus 30'. The average of these reading is
    zero, no I.E. If the  readings were minus 20' and plus 40' then the I.E.
    would be plus 10' . This avoids using the horizon.
    
    
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