File:Ignitrons.jpg
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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
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:15, 14 June 2014 | | 723 × 439 (98 KB) | Chetvorno | User created page with UploadWizard |
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