Several years ago (OK, the last millenium) I GPS disciplined a friend of mines
200 year old grandfather clock that she had inherited. I used a solenoid to
nudge the pendulum. Surprisingly, it worked quite well the first time. The
biggest problem was the pendulum did not swing at a 1Hz rate. I think it was
needed like 24 pulses/minute. I later played with using a
magnet/electromagnet instead of the solenoid, but it did not seem to work as
well.
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