File:Early triode vacuum tubes.jpg
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Summary
DescriptionEarly triode vacuum tubes.jpg |
English: The first triode vacuum tubes from around 1918, all derived from the Audion tube, invented by Lee De Forest in 1906. The recognition of the Audion's ability to amplify signals, around 1912, caused its rapid development by several organizations.
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Date |
before 1918 date QS:P,+1918-00-00T00:00:00Z/7,P1326,+1918-00-00T00:00:00Z/9 |
Source | Downloaded July 22,2013 from The Principles Underlying Radio Communication, National Bureau of Standards radio pamphlet no. 40, US Signal Corps. December 10, 1918, US Government Printing Office, p. 321, fig. 250 on Google Books |
Author | Unknown authorUnknown author |
Licensing
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Annotations InfoField | This image is annotated: View the annotations at Commons |
High power Audions, which De Forest called "Oscillions", for transmitters
Low power pliotrons for receiving, designed by Irving Langmuir at General Electric
High power triodes for transmitters made by AT&T (Western Electric)
French triodes
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:32, 27 July 2013 | 1,080 × 1,756 (409 KB) | Chetvorno | User created page with UploadWizard |
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JPEG file comment | Created with GIMP |
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