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Fitxer:Signaling by Napoleonic semaphore line.jpg

Fitxer original ‎(1.075 × 912 píxels, mida del fitxer: 265 Ko, tipus MIME: image/jpeg)

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Descripció
English: Illustration of communication by mechanical semaphore in 1800s France. Lines of towers supporting semaphore masts were built within visual distance of each other. The arms of the semaphore were moved to different positions, to spell out text messages. The operators in the next tower would read the message and pass it on. Invented by Claude Chappee in 1792, semaphore was a popular communication technology in the early 19th century until the telegraph replaced it.
Data
Font Retrieved June 11, 2014 from Radio News magazine, Ziff-Davis Publishing Co., Inc., New York, Vol. 32, No. 5, November 1944, p. 71 archived on http://www.americanradiohistory.com/
Autor The drawing is signed "Keith Thomas" in lower right corner
Permís
(Com reutilitzar aquest fitxer)		 This image is from an advertisement by Universal Microphone Co. without a copyright notice published in a 1944 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.

Llicència

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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actual17:12, 2 abr 2015Miniatura per a la versió del 17:12, 2 abr 20151.075 × 912 (265 Ko)ChetvornoUser created page with UploadWizard

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