File:Spark gap transmitter diagram (alt).png
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Summary
| Description |
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: Norsk bokmål: Skjematisk tegning av gnistsender, en tidlig form for radiosender, brukt til å sende morsekode tidlig på 1900-tallet. Dette eksempelet er hentet fra en amerikansk hobbybok for gutter (publisert i 1917). Den viser et hjemmelaget oppsett, typisk for radioamatører på den tiden.
Endringer: Fjernet bildetekst og markerte telegrafnøkkelen Ordforklaringer: |
| Date | |
| Source | Downloaded 2021-11-03 from Ernest Thompson Seton (1917) The Woodcraft Manual for Boys, Doubleday, Page & Co., New York, p.125, fig.3 on Internet Archive |
| Author | Ernest Thompson Seton |
| Other versions |
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Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:24, 6 November 2021 | | 7,000 × 7,000 (152 KB) | Gutten på Hemsen | Better scan |
| 13:43, 6 November 2021 |  | 7,000 × 7,000 (161 KB) | Gutten på Hemsen | Added missing aerial and ground labels | |
| 13:41, 6 November 2021 |  | 7,000 × 7,000 (152 KB) | Gutten på Hemsen | Uploaded a work by Ernest Thompson Seton from Downloaded 2021-11-03 from Ernest Thompson Seton (1917) The Woodcraft Manual for Boys, Doubleday, Page & Co., New York, p.125, fig.3 on Internet Archive with UploadWizard |
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