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    From: Andrew Corl
    Date: 2004 Dec 13, 07:47 -0500

    I have used one of these in my work.  It is a Topographic Abney Level.  According to a catalog that I have the Abney Level is “very similar to a clinometer in that it is used to measure the value of a slope by means of arc measure and grade percentage.  Commonly used by surveyors, engineers, and foresters.”  I have used one in surveying applications, but never for navigation.  You can go to http://www.benmeadows.com and look one up.  They retail for $104 to $258.00.

     

    Andrew M. Corl

     

       
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