File:Federal 5 kW Poulsen arc transmitter.jpg
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Captions
Captions
Poulsen arc radio transmitter
Summary
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| Description |
English: 5 kilowatt Poulsen arc radio transmitter manufactured by The Federal Telegraph Co for the US Navy during World War 1. The Poulsen arc transmitter, invented by Valdamar Poulsen in 1904 and used until the 1920s, was the first transmitter that could produce continuous sinusoidal waves that could be modulated to carry sound. It generated radio waves using a continuous electric arc in a strong magnetic field in an atmosphere of hydrogen gas. The negative resistance of the arc excited oscillations in a tuned circuit. Shown are the arc chamber (left), the tank circuit (right) and the control panel (center). The arc chamber is sandwiched between the poles of electromagnets (top and bottom) which generate the magnetic field. The anode electrode (assembly on left side of chamber) is hollow and cooling water is circulated through it from the hoses at left. |
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| Source | Retrieved September 23, 2013 from Ellery W. Stone (1919) Elements of Radiotelegraphy, D. Van Nostrand Co., New York, Plate 23 facing p. 156 on Google Books |
| Author | Ellery W. Stone |
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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 13:59, 19 September 2015 | | 1,848 × 1,131 (386 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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