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    Re: Heath vernier sextant
    From: Paul Hirose
    Date: 2012 Jul 24, 15:10 -0700

    Stan K wrote:
    >  Thanks, Ridge, for answering the question about the "pick" tool.
    
    Famed instrument maker W.F. Stanley calls the tool a "tommy-pin" in his
    1901 book on surveying instruments. His description of the vernier
    sextant, its testing and adjustment, may be worth reading.
    
    http://books.google.com/books?id=h3pHAAAAIAAJ&pg=PR11
    
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