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| Keywords: Tesla coil (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg A medical version of a Tesla coil from around 1900 called Gaiffe's Bipolar Resonator manufactured by Adolphe Gaiffe 1830-1903 of Paris used in the obsolete medical field of electrotherapy The Tesla coil is a resonant transformer circuit that produces very high voltage radio frequency alternating current electricity at low current levels In this circuit the outside primary winding of the transformer left is connected to a capacitor in box to make a tuned circuit When powered by a Ruhmkorff coil in box sparks jumping across the spark gap mounted on box excite high frequency oscillations in the primary coil which induce very high voltage oscillations in the secondary coil inside the primary Wires from both sides of the secondary were connected to electrodes which produce high voltage streamer arcs which were applied to parts of the patient's body to treat various ailments in electrotherapy Electrotherapy coils could produce several hundred thousand to one million volts at frequencies of 200 kHz to 2 MHz This procedure was not painful for the patient since high frequency currents above 10 kHz applied to the body do not produce the physiological sensation of electric shock This apparatus was invented and first applied to medicine during the 1890s by Nikola Tesla and Elihu Thomson so it was called a Tesla-Thomson apparatus Information from https //books google com/books id uToXAQAAMAAJ pg PA72 Frederick Finch Strong 1908 High Frequency Currents Rebman Co New York p 72 Tesla coils | ||||
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