File:PSM V56 D0071 Photo of electrical lines emanating from the sending station.png
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Original file (1,638 × 1,066 pixels, file size: 379 KB, MIME type: image/png)
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Summary
| Description |
English: Photo of RF streamers emanating from the terminal of a high voltage spark-gap radio transmitter, created by running the wire through a piece of film. From the text: "It is very easy to detect the electric lines which emanate from every part of such a wire when a spark jumps between the terminals of the coil. All that is necessary to do is to pass the wire through a sensitive film and develop the film. The accompanying photograph was taken at the top of such a wire by means of a very powerful apparatus at my command" |
| Date | between 1899 and 1900 |
| Source | John Trowbridge (November 1899) "Wireless Telegraphy" Popular Science Monthly, D. Appleton & Co., Vol. 56, p. 63, fig. 3 on Internet Archive website |
| Author | Unknown author |
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 | 05:09, 6 June 2011 | | 1,638 × 1,066 (379 KB) | Ineuw |
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