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    Re: Drum Sextants
    From: Alexandre Eremenko
    Date: 2005 Jun 17, 11:08 -0500

    I have an SNO-T (which may be or may not to be
    super-quality). The drum is divided into whole minutes,
    and has no vernier (nonius).
    I have no difficulty in reading it to 0.1' precision.
    When I compared it with Bills Astra 3 (which has a nonius
    divided to 0.2') I did not find Astra easier to read.
    My impression is that reading the drum without nonius
    is quicker and more convenient than the one with a nonius.
    
    This might answer your question.
    
    P.S. Unlike all other modern sextants, SNO-T
    has a magnifying glass helping to read the drum.
    But no nonius.
    
    On Wed, 15 Jun 2005, Mike Burkes wrote:
    
    > I have always wondered why super quality sextants like some Plaths and others
    > do not have their minute scales further divided into tenths.
    > I would appreciate any feedback regarding that and thanks much!
    > Mike Burkes
    
    
    

       
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