File:Tesla high-frequency apparatus (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg

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English: "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.
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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 2010960 × 540 (77 KB)Andy Dingley (talk | contribs){{Scans from 'Rankin Kennedy, Electrical Installations', 1903 |volume=V |page= |figure= |title= |description= }} Category:Tesla coils

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