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    Re: micrometer sextants.
    From: Frank Reed
    Date: 2007 Oct 27, 22:51 -0400

    Check editions of "Brown's Nautical Almanac" for this period. I have copies
    from 1930 and 1936. By 1936, all of the sextants advertised have
    micrometers. In 1930, the use of the micrometer is explained in several ads.
    It is listed as an optional accessory that can be ordered for any sextant
    for two pounds (factory installed). One ad shows a high-end vernier sextant
    that has a micrometer drum, too. A perfect example of a transitional
    instrument.
    
     -FER
    http://www.HistoricalAtlas.com/lunars
    
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