File:Video tape scanning diagrams.png

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Description
English: Diagrams showing the difference between helical-scan and transverse-scan recording techniques used in early video tape recorders.
Date
Source Retrieved August 3, 2014 from Joseph Rolzen, "Television Tape Techniques Today" in Broadcast Engineering magazine, Howard W. Sams and Co. Inc., New York, Vol. 5, No. 11, November 1963, p. 20 on American Radio History] website
Author Joseph Rolzen
Permission
(Reusing this file)		 This 1963 issue of Broadcast Engineering magazine would have the copyright renewed in 1991. 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 1978 to present show no renewal entries for Broadcast Engineering. Therefore the magazine's copyright was not renewed and it is in the public domain.

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Public domain
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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current17:26, 4 August 2014Thumbnail for version as of 17:26, 4 August 2014403 × 713 (65 KB)Chetvorno (talk | contribs)User created page with UploadWizard

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