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I don't know why that name was chosen but it continues the SI practice ofIan,
naming selected derived units directly after people. It has been the
official SI name for at least 25 years, probably much longer. As far as I
know mho was never an SI name, so as far as the International System is
concerned there was no change from mho to siemens. Since there was no
famous scientist called mho, it is unlikely that the International
Conference on Weights and Measures would have considered mho as a unit
name. I think that mho was introduced by American texts in the olden days
of mixed cgs and mks units, before SI.
Ian Sefton (I.Sefton@physics.usyd.edu.au)
School of Physics A28
University of Sydney NSW 2006
AUSTRALIA