File:Marconi operator aboard ship "Deutschland", at his instruments LCCN2014683102.jpg
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Summary
[edit]DescriptionMarconi operator aboard ship "Deutschland", at his instruments LCCN2014683102.jpg |
English: Title: Marconi operator aboard ship "Deutschland", at his instruments
Radio operator in the radio room of the German ocean liner SS Deutschland probably in 1914, showing the early Marconi wireless telegraphy equipment. On the right is the spark transmitter, consisting of an induction coil, Leyden jar capacitors behind it, spark gap, and an oscillation transformer ("jigger") inside the wooden box on the wall. The operator transmitted information by tapping on a switch called a telegraph key (visible behind coil) which turned the spark on and off, transmitting pulses of radio waves to spell out text messages in Morse code. On the left is the receiver, which recorded Morse code messages with an ink line on paper tape, which the operator later translated into text. The equipment was produced by the Marconi Wireless Telegraph Co and the radio operator was also an employee. British-Italian entrepreneur Guglielmo Marconi invented the first practical radio transmitters and receivers in 1896. The first major use of radio was on ships, to keep in touch with the shore and call for rescue in emergencies, and Marconi's company dominated the marine wireless industry throughout the spark era until the 1920s, to the degree that the ship radio room was called the "Marconi room". Abstract/medium: 1 negative : glass ; 5 x 7 in. or smaller. The center portion of the photograph is overexposed. |
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Source |
Library of Congress
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Author | Bain News Service, publisher | ||
Permission (Reusing this file) |
No known restrictions on publication. For more information, see George Grantham Bain Collection - Rights and Restrictions Information https://www.loc.gov/rr/print/res/274_bain.html
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Collection InfoField | George Grantham Bain Collection | ||
Notes InfoField |
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Part of InfoField | bain collection · prints and photographs division | ||
Subject InfoField | glass negatives | ||
Genre InfoField | Glass negatives |
Licensing
[edit]Public domainPublic domainfalsefalse |
This work is from the George Grantham Bain collection at the Library of Congress. According to the library, there are no known copyright restrictions on the use of this work. |
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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current | 08:21, 11 April 2018 | 5,785 × 4,204 (2.51 MB) | Fæ (talk | contribs) | Upscale 1,024 × 744 → 5,785 × 4,204 | |
06:11, 26 February 2018 | 1,024 × 744 (127 KB) | Fæ (talk | contribs) | Library of Congress George Grantham Bain Collection ? LCCN 2014683102 jpg # 4,292 / 41,453 |
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