Fil:Mechanical spinning disk television camera 1931.jpg
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Beskrivelse
| Beskrivelse |
English: An early mechanical-scan television camera made by Jenkins Co., Passaic, New Jersey, used in experimental television broadcasts in the 1930s. This used a large spinning disk called a Nipkow disk (visible in housing at front of camera) pierced by a spiral pattern of holes, rotating behind the lens. Each hole, passing across the image, produced a scan line of video. A phototube in back of the disk produced a video signal which varied with the brightness of the image at each point. Dozens of experimental television stations during the 1920s and 30s broadcast with these mechanical-scan television systems. |
| Dato | |
| Kilde | Retrieved March 20, 2014 from Delbert E. Replogle, "Jenkins Televises with New Lighting System" in Television News magazine, published by Popular Book Corp., New York, Vol. 1, No. 4, September-October 1931, p. 247 on AmericanRadioHistory.com website |
| Opphavsperson | Delbert E. Replogle |
| Tillatelse (Gjenbruk av denne filen) |
This 1931 issue of Television News magazine would have the copyright renewed in 1959. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1958, 1959, and 1960 show no renewal entries for Television News. Therefore the magazine's copyright was not renewed and it is in the public domain. |
Lisensiering
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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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| Dato/klokkeslett | Miniatyrbilde | Dimensjoner | Bruker | Kommentar | |
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| nåværende | 12. aug. 2014 kl. 22:01 | | 616 × 739 (82 KB) | Chetvorno | User created page with UploadWizard |
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