File:NSRW Telegraphy, Wireless - coherer.png

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NSRW_Telegraphy,_Wireless_-_coherer.png (697 × 205 pixels, file size: 26 KB, MIME type: image/png)

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English: Diagram of a coherer, an electric device used with wireless telegraphy: (T) exhausted glass tube; (PP) silver terminals separated by metal filings and connected with (A) vertical wire and (E) ground.
Date published 1914
Source “Telegraphy, Wireless,” The New Student's Reference Work, v. 4, p. 1882, fig. II.
Author Unknown authorUnknown author
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:NSRW_Telegraphy,_Wireless_-_coherer.png
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This file has been extracted from an original image in The New Student's Reference Work: File:LA2-NSRW-4-0428.jpg.

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Public domain

The author died in 1936, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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current21:15, 22 February 2018Thumbnail for version as of 21:15, 22 February 2018697 × 205 (26 KB)Bob Burkhardt (talk | contribs){{Information |description ={{en|1=Diagram of a coherer, an electric device used with wireless telegraphy: (''T'') exhausted glass tube; (''PP'') silver terminals separated by metal filings and connected with (''A'') vertical wire and (''E'') ground.}} |source =“Telegraphy, Wireless,” ''The New Student's Reference Work'', v. 4, p. 1882, fig. II. |author ={{unknown}} |date =published 1914 |permission ={{PD-1923}} }} Category:Wireless telegraphy Category:Coherers

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