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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
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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.
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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
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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
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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
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de l'époque. Utilisé pour envoyer des signaux du code Morse au cours de la " télégraphie sans fil " entre 1900 et 1920.
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The following pages on the
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hobbyists of the time. Alterations to image: removed caption and added label to telegraph key.
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432://commons.wikimedia.org/File:Spark_gap_transmitter_diagram_(alt).png
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Click on a date/time to view the file as it appeared at that time.
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Endringer: Fjernet bildetekst og markerte telegrafnøkkelen
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indicating the copyright status in the source country.
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Commons is a freely licensed media file repository.
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393:) before January 1, 1929.
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841:Spark-gap transmitter
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199:- Leyden jars –
194:- Tuning coil –
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183:radiamateurs
171:onde amortie
165:Schéma d'un
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765:Better scan
140:Description
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728:Dimensions
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271:Battery –
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27:File usage
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449:Captions
258:gnistgap
206:éclateur
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734:Comment
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489:depicts
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423:PD-1923
381:in the
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132:Summary
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357:false
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
.png){kind=link}