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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
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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
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290:), 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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Chappee in 1792, semaphore was a popular communication technology in the early 19th century until the
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magazine, Ziff-Davis
Publishing Co., Inc., New York, Vol. 32, No. 5, November 1944, p. 71
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132:Description
856:File usage
813:Dimensions
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710:media type
470:Tiếng Việt
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908:Σημαφόρος
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888:Телеграф
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