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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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