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.
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| 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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Permission
( Reusing this file ) |
Public domain in USA - published prior to 1920 in USA |
Licensing
|
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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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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