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    Older Davis Master Sextant
    From: Renee Mattie
    Date: 2003 Aug 28, 11:31 -0400

    I have seen a couple of older "Davis Master Sextants" for sale on EBay
    recently.
    This is clearly not the Mark 15 or Mark 25 -- the micrometer drum is put on
    differently, and the vernier scale is fixed at the end of the arm, parallel
    to the arc scale
    on the body.
    
    In general, though, it looks a lot like the Mark 15 or Mark 25.
    The seller of this one:
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3623946817&category=793&r
    d=1#ebayphotohosting
    said he read something about "mark 12 sextant adjustment"
    in the manual.
    
    Was there a Davis Mark 12 Master Sextant?
    (as in the title of the manual that comes with it)
    
    Or is this the Davis Mark 20?
    
    Was it made of the same plastic used in the Mark 15/25?
    Did the gearing work the same way?
    Would I find the precision and ease of use more or less equivalent
    to that of the Mark 15/25?
    How about details such as the construction and mounting of the
    filters and mirrors?
    
    Thanks in advance for sharing your knowledge of these older
    Davis Master Sextants.
    
    Renee
    
    
    

       
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