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Ignitrons.jpg (723 × 439 pixels, file size: 98 KB, MIME type: image/jpeg)

Summary

Description
English: High power ignitron rectifiers, 1945. The ignitron was a mercury filled device used as switches and rectifiers in high power industrial processes. A trigger pulse on the firing electrode starts a mercury arc between the carbon anode and the mercury pool cathode.
Date
Source Retrieved June 13, 2014 from Glenn Bradford, "Electronics at Work" in Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 33, No. 6, June 1945, p. 51 on American Radio History archive
Author Glenn Bradford
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.

Licensing

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.

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June 1945

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Date/TimeThumbnailDimensionsUserComment
current18:15, 14 June 2014Thumbnail for version as of 18:15, 14 June 2014723 × 439 (98 KB)ChetvornoUser created page with UploadWizard

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