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File:Signal Corps SCR-54A crystal radio.jpg

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Summary

Description
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
Permission
(Reusing this file)		 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.
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.

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Date/TimeThumbnailDimensionsUserComment
current16:40, 15 March 2010Thumbnail for version as of 16:40, 15 March 2010772 × 755 (98 KB)Chetvorno{{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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