File:Iconoscope diagram.png

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Description
English: Diagram showing how the iconoscope works. The iconoscope, invented in 1933 by American electrical engineer Vladimir Zworykin, was the first practical video camera tube, and was used in early television broadcasts.
Date
Source Retrieved June 12, 2014 from Edward M. Noll, "Television Transmitting Equipment" in Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 33, No. 3, March 1945, p. 134, fig. 6 on American Radio History archive
Author Edward M. Noll
Permission
(Reusing this file)		 This 1945 issue of Radio News magazine would have the copyright renewed in 1973. 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 1973 show no renewal entries for Radio News. 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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