File:Three GE amplidynes 1951.jpg

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Three_GE_amplidynes_1951.jpg (413 × 288 pixels, file size: 20 KB, MIME type: image/jpeg)

Captions

Captions

Amplidyne electromechanical amplifiers

Summary

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Description
English: Three amplidynes made by General Electric Co., from an advertisement in a 1951 magazine.
  • Top left - 1 kW amplidyne motor-generator
  • Bottom left - 3 kW amplidyne motor-generator
  • Right - 5 kW amplidyne generator
An amplidyne is a rotating machine that functions as an amplifier. It consists of an electric motor turning a DC generator. The electric signal to be amplified is applied to the generator's field windings. The output voltage is proportional to the field current. Amplidynes are used in power industrial servo and control systems.
Date
Source Retrieved from Electronics magazine, McGraw-Hill Publishing Co., New York, Vol. 24, No. 2, February 1951, p. 138 on http://www.americanradiohistory.com/
Author Unknown authorUnknown author
Permission
(Reusing this file)		 This image is from an advertisement without a copyright notice published in a 1951 US magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.

Licensing

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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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