File:Spark gap transmitter diagram.png

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Summary

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 - Tuning coil – fr:Bobine (électricité) - Leyden jars – fr:Bouteille de Leyde - Spark gap – fr:éclateur - Induction coil – fr:Bobine de Ruhmkorff - Telegraph key – fr:Manipulateur morse - Battery – fr:Pile électrique
Date	1917
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
Other versions	Spark gap transmitter diagram (alt).png

Public domain	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.	United States
	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
current	05:13, 2 March 2010		967 × 955 (51 KB)	Chetvorno	{{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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