File:Langmuir mercury diffusion pump.jpg
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![File:Langmuir mercury diffusion pump.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Langmuir_mercury_diffusion_pump.jpg/517px-Langmuir_mercury_diffusion_pump.jpg?20130827121620)
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[edit]DescriptionLangmuir mercury diffusion pump.jpg |
English: Early mercury diffusion pump developed by Irving Langmuir at General Electric in 1916. The diffusion pump is the vertical chamber in the foreground, the machine in the background is the "backing pump" required to establish the initial low vacuum. The mercury diffusion pump was invented by German researcher W. Gaede in 1913. Langmuir's innovation was a nozzle that directed the mercury vapor away from the inlet, allowing the inlet to be made larger, greatly increasing the pumping speed. He received a patent on his "mushroom cap" nozzle in 1921. The Langmuir pump, which achieved pressures down to 10-10 atmosphere, enabled the production of the first "hard vacuum" thermionic valves (vacuum tubes) which dominated radio and electronics technology for 50 years. It also was important for making incandescent light bulbs. Alterations to image: removed unrelated text from accompanying article from white area in upper right corner of image. |
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Source | Downloaded August 27, 2013 from E. E. Free "The bottle filled with .000,000" in Popular Radio (Popular Radio, Inc., New York), Vol. 2, No. 2, October 1922, p. 94 |
Author | E. E. Free |
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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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current | 12:16, 27 August 2013 | ![]() | 1,224 × 1,420 (257 KB) | Chetvorno (talk | contribs) | {{Information |Description ={{en|1=Mercury diffusion pump invented by en:Irving Langmuir at en:General Electric in 1916. The diffusion pump is the vertical chamber in the foreground, the machine in the background ... |
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