File:Pyrite cat whisker detector.jpg
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Pyrite_cat_whisker_detector.jpg (548 × 372 pixels, file size: 121 KB, MIME type: image/jpeg)
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Summary
| Description |
English: Photo of a "Pyron" detector, from a 1914 amateur radio book. Contact with the crystal of iron pyrite (fool's gold) is facilitated by means of a fine wire mounted on one end of a variable positioning mechanism. It was manufactured by the Wireless Specialty Apparatus Co. Alterations to image: cropped out second image of detector. |
| Date | |
| Source | Downloaded 2009-11-08 from Alfred Powell Morgan (1914) Wireless Telegraph Construction for Amateurs, 3rd Ed., p. 199, fig. 163 on Google Books |
| Author | Alfred Powell Morgan |
| Permission (Reusing this file) |
Public domain in USA - published in USA prior to 1923 |
Licensing
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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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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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:14, 3 May 2021 | | 548 × 372 (121 KB) | Materialscientist | rotation, FFT |
| 17:20, 8 November 2009 |  | 548 × 372 (86 KB) | Chetvorno | {{Information |Description={{en|Photo of a "Wikipedia:cat's whisker detector", an antique radio component used in early crystal radio receivers, from a 1914 amateur radio book. This was called a "Pyron" type. It consisted of a fine wire on an adjus |
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