[time-nuts] Re: Grandfather clock sync'd to 1PPS

[Tom Van Baak]

 > 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, vilgotch1 at 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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