On 09/09/2021 03:36, Bill Beam wrote:
Tom,

How long do you expect your proposed voult to go undisturbed?
I have several pendulum clocks.  They are disturbed every couple of months
by earth quakes.  By disturbed, I mean pendulum banging against the case 
walls....
Any ground motion that can be felt will upset the clocks.  Often the clocks will
signal an earth quake that is not felt.

Good luck.

Bill Beam
NL7F

Bill,

It sounds as if you live in an area where monitoring of earthquakes would be of interest! If you haven't got something already, you might like to look at the Raspberry Shake:

  https://raspberryshake.org/

The devices are not at the professional seismograph level. They operate a world-wide network.

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
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