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visual telegraphy

См. также в других словарях:

  • Wireless telegraphy — The term Wireless Telegraphy is a historic term used today as applied to early radio telegraph communications techniques and practices. Wireless telegraphy originated as a term to describe electrical signaling without the electric wires to… …   Wikipedia

  • Semaphore line — This article is about the communication system using towers with pivoting shutters. For other uses, see Semaphore (disambiguation). For the now closed railway in Adelaide, Australia, see Semaphore railway line, Adelaide. A Chappe telegraph at… …   Wikipedia

  • Telecommunication — A parabolic satellite communication antenna at the biggest facility for satellite communication in Raisting, Bavaria, Germany …   Wikipedia

  • History of telecommunication — The history of telecommunication began with the use of smoke signals and drums in Africa, the Americas and parts of Asia. In the 1790s the first fixed semaphore systems emerged in Europe however it was not until the 1830s that electrical… …   Wikipedia

  • telegraph — telegrapher /teuh leg reuh feuhr/; esp. Brit., telegraphist, n. /tel i graf , grahf /, n. 1. an apparatus, system, or process for transmitting messages or signals to a distant place, esp. by means of an electric device consisting essentially of a …   Universalium

  • SOS — is the commonly used description for the international Morse code distress signal (· · · · · ·). This distress signal was first adopted by the German government in radio regulations effective April 1, 1905, and became the worldwide standard when… …   Wikipedia

  • Videoconferencing — See also: List of video telecommunication services and product brands A Tandberg T3 high resolution telepresence room in use (2008) …   Wikipedia

  • Morse code — Chart of the Morse code letters and numerals Morse code is a method of transmitting textual information as a series of on off tones, lights, or clicks that can …   Wikipedia

  • Beacon — For other uses, see Beacon (disambiguation). A beacon is an intentionally conspicuous device designed to attract attention to a specific location. Beacons can also be combined with semaphoric or other indicators to provide important information,… …   Wikipedia

  • Crystal radio — Crystal set redirects here. For the Australian rock band, see The Crystal Set. A modern reproduction of an antique crystal set. It is tuned to different stations by moving the sliding contact (right) up and down the tuning coil (red). The device… …   Wikipedia

  • Broadcasting (Amendment) Act 2007 — The Broadcasting (Amendment) Act 2007 is an Act of the Oireachtas (Irish parliament).It deals with Irish Analogue broadcasting systems and the amendment of legislation on Digital Terrestrial Television dating back to 2001. This act amends… …   Wikipedia

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