File:Lee De Forest with Audion tubes.jpg

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English: American electrical engineer Lee De Forest, the inventor of the triode vacuum tube, with two of his tubes. De Forest's three electrode tube, which he invented in 1906 and called the "Audion", was the first electrical device which could amplify, and began the field of electronics. The small tube (left) was a low power one watt Audion used in radio receivers. The large tube (right) was a high power 250 watt tube used in radio transmitters, which De Forest called an "oscillion". De Forest began making it in 1919 so that may be the date of this picture.
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Source Downloaded August 27, 2013 from James H. Collins "The genius who put the jinn in the radio bottle", Popular Science" Vol. 1, No. 1, May 1922, p. 31 on Google Books
Author Unknown authorUnknown author

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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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current09:01, 3 September 2013Thumbnail for version as of 09:01, 3 September 20131,560 × 1,676 (289 KB)Chetvorno (talk | contribs)User created page with UploadWizard

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