Tesla's electro-mechanical oscillator or earthquake machine is a steam-powered mechanical oscillator invented by Nikola Tesla in 1898. The machine which Tesla tested was small, around seven inches (178 mm) long, and weighing one or two pounds; something "you could put in your overcoat pocket". It was reported that in 1898 Tesla's New York lab was nearly shaken to pieces by this little device, operated by five pounds of air pressure acting against a special pneumatic piston device.
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