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Image: Iconoscope diagram

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Description: 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.
Title: Iconoscope diagram
Credit: 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: 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.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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