File:Diathermy of back w condenser pads 1940s.jpg

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Diathermy_of_back_w_condenser_pads_1940s.jpg (400 × 210 pixels, file size: 22 KB, MIME type: image/jpeg)

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Description
English: Diathermy treatment of spine using condenser pads in 1945. Diathermy is the application of radio frequency current to body tissues to cause deep heating. In this example two metal plate capacitive electrodes are placed on the back, with insulating pads separating them from the skin, and the high frequency current from the diathermy machine applied between them. Each electrode acts as one plate of a capacitor, with the body tissue under it as the other plate. The high oscillating potential between the plates induces an alternating current to flow through the body tissues between the plates, warming them.
Date
Source Retrieved October 2, 2015 from Richard Kovács (1945) Electrotherapy and Light Therapy, 5th Ed., Lea and Febiger, Philadelphia, p. 230, fig. 166 on https://archive.org/
Author Richard Kovács
Permission
(Reusing this file)		 This 1945 book would have the copyright renewed in 1973. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for 1972, 1973, and 1974 show no renewal entries for Electrotherapy and Light Therapy. Therefore the copyright was not renewed and it is in the public domain.

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Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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