Tesla's Earthquake Machine...
(www.forbes.com)
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It was basically a jackhammer.
https://en.wikipedia.org/wiki/Tesla%27s_oscillator
An oscillator isn't the same as a jackhammer... The oscillator used sound harmonics if I remember correctly...
A jackhammer is a pneumatic oscillator.
Tesla used an impact at each stoke, more like a square wave, instead of a crank with a sine wave output.
A square wave has plenty of harmonics.
My understanding of this --- it's half of a mechanical multivibrator. Old tube radios in cars used multivibrators to up the voltage for the vacuum tubes.
Interesting.. Thank you ...