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| Keywords: Oudin coil - Treatment by the effiuvation method.jpg An Oudin coil used for 'electrotherapy' treatment of a patient's knee around 1907 The Oudin coil left invented in 1893 by physician Paul Marie Oudin was a spark-excited resonant transformer circuit similar to a Tesla coil which generated very high voltage low current radio frequency electricity used until perhaps 1925 in the Victorian era field of electrotherapy The doctor holds an insulated electrode with sharp metal points B connected to the top high voltage terminal of the coil which produced a luminous brush discharge called effluves which was directed toward the patient's knee The patient holds a ground electrode A attached to the bottom of the coil which made a return path for the current The apparatus which drives the coil a spark gap S M and two Leyden jar capacitors L J can be seen below the coil Note the doctor's other hand D left adjusting the tap on the coil The motion of the electrode changed the capacitance of Oudin coils throwing them out of resonance so during use they had to be constantly adjusted to keep them in tune <br/><br/> Photo caption Treatment by the effluvation method The condenser electrode B is in connection with the top of the resonantor Patient is seated upon an insulated platform holding the electrode A which is the other pole from the outer side of the Layden jar L J By groudning the outer side of the Leyden jar A the patient's insulation is unnecessary and better effiuavation is attained S M is the spark-gap Mihran Krikor Kassabian Roentgen Rays and Electro-Therapeutics J B Lippincott Co Philadelphia USA Page 168 Figure 67 http //www archive org/details/rontgenrayselect00kassiala Online 1907 Mihran Krikor Kassabian Public domain - Kassabian died 1910 PD-old Oudin coils 1900s diagrams | ||||
