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    Poor Line of Position Computer
    From: Chuck Griffiths
    Date: 2002 Feb 19, 12:44 -0500

    Has anyone seen or used a Poor Line of Position Computer? Of all the mechanical
    devices described in Bowditch in the history of sight reduction section it
    appears to have been a device that should have been popular. For anyone not
    familiar, it's described as a circular slide rule device with multiple rings
    that could solve the cosine haversine equation to a tabulated accuracy of 10'
    with further interpolation possible. It's not clear however just how big one is
    or whether they were ever very widely used. I can't help but wonder if they
    would have been more popular had the inventor Charles Poor not chosen to market
    the device under his surname.
    Chuck Griffiths
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