"Jeff" wrote
Smith did not invent the Smith Chart. He simplified, for HF use
only,
charts which had been in existence since the Victorian Age, which
covered all transmission line frequenies down to telephone and
power
frequencies.


That is not quite correct, what Smith did was to take to concept of
the
pre-existing equations and a rectangular chart which covered a
limited range
of impedances and develop them into a circular, more complex chart,
that
covered a full range of impedances. See the Introduction to Smith's
book
"Electronic Applications of the Smith Chart".

Regards
Jeff
=========================================

Agreed. Your description of what Smith did is more accurate than
mine.
----
Reg.