Image: Ducretet Tesla coil

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Description: Small medical Tesla coil used for electrotherapy around the turn of the century, manufactured by the Eugene Ducretet firm of Paris. The coil itself (T) is immersed in a tank of oil to prevent current leakage due to corona discharge. It is connected to a Leyden jar (L, right) to make a tuned circuit, and a spark gap (e), powered by a Ruhmkorff coil (not shown) One of the high voltage terminals (E) is attached through a wire to a pointed electrode on an insulated wand which produces a brush discharge which is applied to parts of the patients' body to treat various ailments. The other high voltage terminal is attached to a ground electrode which the patient holds.
Title: Ducretet Tesla coil
Credit: Retrieved December 3, 2014 from Chisolm Williams (1905) High Frequency Currents in the Treatment of Some Diseases, Rebman, Ltd., London, p. 98, fig. 47 on Google Books
Author: Unknown. The drawing is probably from the Ducretet company catalog
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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History of the Tesla coil

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