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    Re: dip, dip short, distance off with buildings, etc.
    From: Michael Bradley
    Date: 2006 Jan 11, 19:16 -0000

    Interesting physics, and enjoyable banter, however...
    
    My understanding is that terrestrial surveyors  of old ( and RN surveyors of
    land features)got their local horizontal datum from a highly portable
    reference source, i.e. a leather bag of mercury. Exactly as the technique
    for finding the position of the back garden using a paint roller tray full
    of oil. In that type of situation, what's dip and near horizon refraction
    got to do with anything...why not do as the oldies did and avoid the
    problem...?
    
    Michael B
    55 04 N 001 27 W
    
    
    

       
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