File:Vacuum electrotherapy electrode.JPG
Vacuum_electrotherapy_electrode.JPG (513 × 208 pixels, file size: 13 KB, MIME type: image/jpeg)
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DescriptionVacuum electrotherapy electrode.JPG |
English: A vacuum tube electrode used in electrotherapy, an obsolete Victorian-era medical therapy, used from about 1890s to the 1930s. The electrode is used to apply high voltage radio frequency alternating current (AC) electricity from a Tesla or Oudin coil to the body to treat various ailments. It consists of a partially evacuated glass bulb with a metal plate sealed inside with an insulated handle. A wire from the high voltage terminal of the coil is attached to the terminal (upper right) of the electrode, and the glass bulb is applied to the skin. The high potential ionizes the gas in the bulb, giving off a violet glow. Only a very small amount of current could pass through the capacitance of the glass wall of the tube into the patient, making the treatment safe. The text says if applied to the skin the patient feels only a warm sensation, while if applied through layers of clothing he feels a prickling from sparks. The patient held a ground electrode attached to the bottom of the coil to serve as a return path for the current. Several hundred thousand to one million volts and frequencies of 200 kHz to 2 MHz were used. |
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Source | Retrieved April 19, 2015 from Charles S. Potts, Henry K. Pancoast (1911) Electricity, Lea and Febiger, New York, p. 240, fig. 206 |
Author | Charles S. Potts |
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Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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current | 22:10, 20 April 2015 | 513 × 208 (13 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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