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I found David's exposition exhilarating - as I often do.
I note my regrettable tendency to pick on microscopic
blots in erudite academic pieces and so, despite the finer part
of my nature I cannot resist remarking that a 60 Hz solenoid is
found to be a viable (and delightfully simple) method of driving
a Foucault's pendulum of period approaching 10 seconds. (*)
Whatcott Altus