There was a reason to measure bore diameters on the bowl end. When
Harrington was doing his research, bowl shape was the only reliable
dating method.

There were lots of controversies about methods during the period when
the Harrington and Binford methods were introduced, and it took about
ten years for the dust to settle.  One of the arguments against
bore-diameter dating involved variation within a bore, caused by
movements of the wire.

However, one must remember that statistical systems paint with a
broad brush, and individual variations are immaterial from the
general point of view.



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