File:AT&T rhombic antenna 1937.jpg
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| Description |
English: An early rhombic antenna in 1937 in Dixon, California, USA. It was built by the American Telephone and Telegraph Co. for long distance telephone service to the Far East via shortwave radio. It communicates with a station in Shanghai, China, 6100 miles away. The antenna consists of two parallel wires strung in the shape of a rhombus from telephone poles. It is fed from the near end and terminated by a transmission line at the far end. |
| Date | |
| Source | Retrieved March 29, 2015 from "You can talk to China via S-W phone" in Short-Wave and Television magazine, Popular Book Corp., New York, Vol. 8, No. 6, October 1937, p. 280 on http://www.americanradiohistory.com. |
| Author | Unknown author |
| Permission (Reusing this file) |
This 1937 issue of Short-Wave and Television magazine would have the copyright renewed in 1965. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1964, 1965, and 1966 show no renewal entries for Short-Wave and Television. Therefore the copyright was not renewed and it is in the public domain. |
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:01, 26 May 2015 | | 385 × 226 (13 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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