Nikola Tesla revealed that an earthquake which drew police and ambulances to the region of his lab at 48 E. New York-1898 was the result of a machine he was experimenting with at the time which "you could put in your overcoat pocket"

Tesla's mechanical power transmission system, was based primarily upon his reciprocating engine invention, patent US514 -Reciprocating Engine- February 6,1894. While the fundamental operating principles of Tesla's mechanical oscillator are well understood, little has been said about how the machine would have been used for underground prospecting.

The el.mech oscillator was originally designed as a source of isochronous(frequency stable), alternating electric current used with both wireless transmitting and receiving apparatus. In dynamical syst. theory an oscillator is called isochronous if the frequency is independent of its amplitude.

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