Telegeodynamics
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Telegeodynamics is an electromechanical earth-resonance concept for underground seismic exploration proposed by Nikola Tesla. He designed this system for use in prospecting and discerning the location of underground mineral structures through the transmission of mechanical energy through the subsurface. Data from reflected and refracted signals can be analyzed to deduce the location and characteristics of underground formations. Additional non-mechanical responses to the initial acoustic impulses may also be detected.
The electromechanical oscillator was originally designed as a source of isochronous, that is to say, frequency stable, alternating electric current used with both wireless transmitting and receiving apparatus.
The underlying principles are discussed in Tesla's paper, "Relative Merits of the Lucas Method of Prospecting by Detonations of Explosive Compounds and of The Tesla Method of Prospecting by Isochronous Oscillations Theoretically Considered" available in the book, Nikola Tesla's Teleforce & Telegeodynamics Proposals, Leland Anderson and Gary Peterson, editors, Twenty First Century Books, 1998, ISBN 0-9636012-8-8