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Summary
| Description |
Collection of early triode vacuum tubes belonging to American inventor Lee De Forest, the inventor of the triode, from 1920. Description of tubes from caption (VF is the filament voltage, VP is the plate voltage, tubes in row numbered L to R)
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| Date | |
| Source | Downloaded September 2, 2013 from Hendrik van der Bijl "Practical operation of thermionic detectors" in Scientific American (Scientific American Publishing Co., New York), Vol. 96, No. 2, February 1920, p. 130 on Google Books |
| Author | Lee De Forest |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Annotations | This image is annotated: View the annotations at Commons |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:17, 2 September 2013 | | 1,476 × 1,526 (419 KB) | Chetvorno | User created page with UploadWizard |
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