File:Hertz drawing of his spark transmitter 1888.png
Hertz_drawing_of_his_spark_transmitter_1888.png (346 × 499 pixels, file size: 21 KB, MIME type: image/png)
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Summary
[edit]DescriptionHertz drawing of his spark transmitter 1888.png |
English: Diagram by Heinrich Hertz of his spark oscillator, the first radio transmitter, with which he discovered radio waves, from an 1888 paper. Hertz did not include many drawings of his equipment in his papers, and this drawing is cropped from a more elaborate drawing. The oscillator consists of a dipole antenna comprised of two collinear metal rods with capacitive metal plates (A, A') on the ends with a spark gap between them. The two sides of the antenna are connected to an induction coil (Rhumkorff coil) (J) powered by a battery (not shown). When Hertz pushed a switch in the primary circuit of the coil it would break the current in the primary, inducing a pulse of high voltage in the secondary which would charge the two sides of the antenna with electric charge. The charge would be discharged through a spark across the spark gap, causing brief oscillating standing waves of current in the antenna. This energy would be radiated by the antenna as a brief pulse of radio waves. Hertz detected the radio waves by tiny sparks across micrometer spark gaps between the ends of loops of wire (not shown) that acted as resonant receiving antennas tuned to the frequency of the transmitter. |
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Source | Original image: Retrieved 28 February 2018 from Heinrich Hertz (1893) Electric Waves, MacMillan and Co., New York, translated by D. E. Jones, p. 108, fig. 25 on Google Books. Originally published in Hertz, H., On the finite propagation velocity of electromagnetic actions, Wiedemann's Annalen, Berlin, Vol. 34, February 2, 1888, p. 551. Alterations to image: Cloned out all additional apparatus besides transmitter |
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Licensing
[edit]Public domainPublic domainfalsefalse |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. 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. | |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:57, 3 March 2018 | 346 × 499 (21 KB) | Chetvorno (talk | contribs) | Cropped out receiving loop antennas leaving only the transmitter | |
00:20, 1 March 2018 | 774 × 499 (35 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Horizontal resolution | 28.35 dpc |
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Vertical resolution | 28.35 dpc |
File change date and time | 23:53, 3 March 2018 |