File:Signal Corps SCR-54A crystal radio.jpg
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editDescriptionSignal Corps SCR-54A crystal radio.jpg |
English: Signal Corps SCR-54A radio set, a crystal radio receiver used by the US Signal Corps during World War I. The cat's whisker detector is the round white device in the upper right area of the panel. |
Date | |
Source | Downloaded 2010-03-15 from Henri Lauer, Harry L. Brown (1920) Radio Engineering Principles, McGraw-Hill, New York, Plate 2, facing p. 93 on Google Books |
Author | Henri Lauer and Harry L. Brown |
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Public domain in USA - published prior to 1920 in USA |
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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 | 16:40, 15 March 2010 | ![]() | 772 × 755 (98 KB) | Chetvorno (talk | contribs) | {{Information |Description={{en|Signal Corps SCR-54A radio set, a Wikipedia:crystal radio receiver used during World War I.}} |Source=Downloaded 2010-03-15 from [[http://books.google.com/books?id=zhdDAAAAIAAJ&pg=PA93#v=onepage&q=&f=false Henri La |
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