File:Spark gap transmitter diagram.png
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DescriptionSpark gap transmitter diagram.png |
English: Diagram of a spark-gap transmitter, the first widely used type of radio transmitter, used to send Morse code signals during the "wireless telegraphy" era between 1900 and 1920. This example, from a 1917 boy's handcrafts book, shows a typical low power set that was homemade by radio amateurs and hobbyists of the time. Alterations to image: removed caption and added label to telegraph key. Français : Schéma d'un émetteur radiotélégraphique de faible puissance à onde amortie montrant les composants électriques utilisés vers 1917, typique de fabrication artisanale par des radio radiamateurs de l'époque. Utilisé pour envoyer des signaux du code Morse au cours de la " télégraphie sans fil " entre 1900 et 1920. Glossaire: - Aerial – fr:Antenne radioélectrique |
Date | |
Source | Downloaded 2010-03-01 from Ernest Thompson Seton (1917) The Woodcraft Manual for Boys, Doubleday, Page & Co., New York, p.125, fig.3 on Google Books |
Author | Ernest Thompson Seton |
Permission (Reusing this file) |
Public domain in USA - published before 1923 in USA |
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Public domainPublic domainfalsefalse |
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 | 05:13, 2 March 2010 | 967 × 955 (51 KB) | Chetvorno (talk | contribs) | {{Information |Description={{en|Diagram of a Wikipedia:spark-gap transmitter, an early radio transmitter used to send Morse code signals during the "Wikipedia:wireless telegraphy" era between 1900 and 1920. This example, from a 1917 boy's handcr |
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