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File:Bethenod - Latour alternator.jpg

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Summary

Description
English: A Bethenod-Latour alternator, a specialized rotating machine that generates radio frequency current, invented during World War 1 by Marius Latour and Joseph Bethenod, which and was used as a high power longwave radio transmitter. It consists of 3 alternators in series, turned by a powerful electric motor. This version produced 225 kW at a frequency of 20 kHz. In order to produce alternating current with high enough frequency for a radio transmitter the alternator had to have many poles and rotate very fast. The advantage of the Bethenod-Latour design was that by combining 3 alternators in series it could produce power at a frequency of 3 times that of each individual alternator, allowing the alternators to rotate slower. Alternator transmitters like this were used from about 1910 to 1930 in superpower transoceanic wireless telegraphy radio stations that exchanged telegraph messages in Morse code with similar stations all over the world.
Date
Source Retrieved 11 October 2013 from Marius Latour, "Radio Frequency Alternators", Proceedings of the IRE (Institute of Radio Engineers, New York), Vol. 8, No. 3, June 1920, p. 238 on Google Books
Author Marius Latour

Licensing

Public domain
Public domain
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.

United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

Captions

Bethenod-Latour alternator radio transmitter, St.Assise, France, 1920

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