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    Vernier reading
    From: Jim Martin
    Date: 2007 Jan 06, 15:35 -0800

    Sirs,
          I have recently purchased an Heath&Co Vernier sextant?.The
    Vernier has the usual 10' divisions,each with five 12"subdivisions.My
    problem is, that there are three 12"divisions to the left of 10', and
    three to right of 0'.What is the purpose for this?.Incidentally the
    main arc reads to 150deg.,hence my query against the use of sextant.The
    certificate is dated 1940
    
                               Jim Martin.
    
    
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