File:Tesla coil (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg

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Description
English: 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 Frederick Finch Strong (1908) High Frequency Currents, Rebman Co., New York, p. 72.
Date
Source Scan from Kennedy, Rankin (1903 edition (five volumes) of pre-1903 four volume edition.) Electrical Installations, vol. V, London: Caxton
Author Andy Dingley (scanner)
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current14:55, 29 June 2010Thumbnail for version as of 14:55, 29 June 20101,004 × 672 (96 KB)Andy Dingley{{Scans from 'Rankin Kennedy, Electrical Installations', 1903 |volume=V |page= |figure= |title= |description= }} Category:Tesla coils
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