[time-nuts] World's most precise.... wall clock

[Hal Murray]

> Maybe one day I'll make this work with a grandfather clock.

Many years ago, Scientific American had an article describing adding a magnet 
to the pendulum and the circuitry to drive it.

The basic idea is to mount a magnet on a stiff wire so that it sticks out to 
the side of the pendulum arm, then mount a coil so the magnet will swing 
through it.  Now pulse the coil to get the desired results.

Scientific American, September 1974, Amateur Scientist
A venerable clock is made highly accurate by equipping it with quartz-crystal works

They want $8 for a pdf.
https://www.scientificamerican.com/article/the-amateur-scientist-1974-09/


-- 
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