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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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