File:Marconi transmitting station Poldhu Cornwall 1900.jpg
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Summary
| Description |
English: Guglielmo Marconi's experimental radiotelegraphy transmitting station, Poldhu, Cornwall, UK in 1900. Marconi was the first person to develop practical radio communication systems. He discovered that the range of transmission could be greatly extended by replacing the dipole antennas used by Heinrich Hertz with a monopole antenna consisting of a wire elevated in the air, with the other side of the transmitter connected to the Earth. This photo shows one of his early monopole antennas, consisting of a metal plate suspended by a wooden arm with a wire running down to his transmitter in the building. The word antenna which in Italian means "tentpole" originated from Marconi.
Alterations to image:Cropped and adjusted contrast to bring out antenna wire as much as possible |
| Date | |
| Source | Retrieved January 14, 2017 from John Ambrose Fleming (1910) The Principles of Electric Wave Telegraphy and Telephony, 2nd Ed., Longmans Green and Co., London, p. 543, fig. 15 on Google Books |
| Author | John Ambrose Fleming |
Licensing
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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. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:21, 3 May 2021 | | 476 × 382 (80 KB) | Materialscientist | FFT |
| 22:03, 14 January 2017 |  | 476 × 382 (49 KB) | Chetvorno | User created page with UploadWizard |
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