[time-nuts] Quartz assisted pendulum clock.
okeefed at newpaltz.edu
Thu Jan 5 09:27:54 EST 2006
Earlier this week I made a claim that I am a Time Nut from way back. In
further evidence of that, I report that I actually clipped and saved that
Reference: Scientific American, September 1974, pages 192 - 198, in a section
called The Amateur Scientist.
The man made a quarts crystal oscillator that sent a pulse to an electromagnet
that was placed near a permanent magnet mounted on the pendulum of a wall (not
a grandfather) clock. The pendulum was set a bit slow for its 72 per minuet
beat and the electronics gave it a push each cycle to make it swing at the
He had faster and slower count settings to adjust its rate. The ultimate check
was still listening to WWV while looking at the clock.
-- Dennis O'Keefe
New Paltz, New York
On Wed, 04 Jan 2006 23:11:07 -0800
Hal Murray <hmurray at suespammers.org> wrote:
> Neat. Thanks.
> I think we had one like that back in grade school. That was a long time
> There was an article in Scientific American 20 or 30 years ago. The idea
>was to make an old grandfather clock keep very good time by adding a magnet to
> the pendulum so you could gently push/pull it.
> Anybody remember that one? Anybody build one?
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