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    Re: Lehmann's Rules
    From: Dave Walden
    Date: 2007 Mar 16, 07:22 -0700

    According to my reading on Lehmann's rules, it is used in the
    situation where one has measured the relative angles between 3 points
    of known location. (Not individually relative to North, but only
    between each.)  ((Sometimes called the three point problem or
    resectioning by surveyors.))  One then wants to plot the location
    where these relative bearings occur.  One first assumes a postion and
    plots.  The case involves systemmatic but non uniform bias induced by
    the incorrect location of the assummed postion.  It does not invole
    random uncertainties.  It is a geometric problem with a single (except
    for the degenerate case of all points lieing on the same circle)
    solution which can be found analytically.  Lehmann's rule gives a
    graphical method of arriving at this unique solution.
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