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| Keywords: Tesla high-frequency equipment (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg D'Arsonval apparatus invented by French physicist and doctor Jacque Arsene D'Arsonval around 1890 used in an obsolete Victorian-era medical field called electrotherapy It was a high frequency resonant oscillation transformer similar to a Tesla coil without the secondary winding which generated high voltage high frequency electricity It consisted of an induction coil rear that generated a high voltage of around 4 - 15 kV This repeatedly charged the two Leyden jar capacitors which repeatedly discharged with a spark through the spark gap The capacitors together with the solenoid coil front formed a tuned circuit and the spark excited damped oscillations in the tuned circuit The device produced an oscillating voltage of 20 - 30 kV with substantial current at frequencies of around 300 kHz - 5 MHz Wires from both ends of the coil to electrodes applied the current to the patient's body It was used for diathermy deep heating of tissue and several other therapies Tesla coils Electrotherapy | ||||
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