> One method of controlling a pendulum but allowing it to swing naturally
Morris,
Here are some examples from the web ...
"Build The Mystery Solar Powered Pendulum", by David Williams
http://nutsvolts.texterity.com/nutsvolts/201208/?folio=32#pg32
"Perpetual Swinging Pendulum", by Bill Bowden
http://www.bowdenshobbycircuits.info/swinger.htm
"Pendulum Driver", by Max Carter
http://maxmcarter.com/pendulum/index.php
"Electromagnetic Pendulum Drive Circuit", by Dick Bipes
https://carveshop.com/wp-content/uploads/2019/10/Electromagnetic-Pendulum-Drive-Circuit.pdf
"Regulated Electromagnetic Pendulum Drive", by Dick Bipes
https://carveshop.com/wp-content/uploads/2019/04/Regulated-Electromagnetic-Pendulum-Drive.pdf
You can also re-purpose commercial pendulum drive circuits. Search for
words like "quartz movements with pendulums" or "clock pendulum drive"
at clock suppliers like: www.timesavers.com, www.klockit.com,
www.clockworks.com
If you're interested in pendulum clocks, there are several large
organizations, magazines, web forums, and mailing lists. Contact me
off-list.
/tvb
On 3/10/2021 9:51 PM, vilgot...@gmail.com wrote:
This has been a most interesting thread.
One method of controlling a pendulum but allowing it to swing naturally that
I am familiar with is to put a small unobtrusive magnet on the bottom of the
bob and an inductor on the base of the clock at the centre of the swing.
Depending on how you arrange the windings you can sense the period and
advance or retard the pendulum as required. It could be done very easily
with an Arduino or similar. It has the advantage that the pendulum can be
adjusted to keep as good time as possible and it will continue to do so if
the power fails.
And on the subject of remembering to wind the clock - the definitive
treatment of this subject is to be found in the opening chapter of "The Life
and Opinions of Tristram Shandy, Gentleman" first published by Laurence
Stern in 1759. I won't spoil the story by revealing the technique, but
suffice it to say that once read it's not easily forgotten!
Cheers,
Morris VK3DOC
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