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telegraph sounder

См. также в других словарях:

  • Telegraph sounder — A Telegraph sounder is a device which produces an audible sound when connected to an operating electrical telegraph. It is similar in form to a relay. When a current flows through the induction coil, the resulting magnetic field attracts an… …   Wikipedia

  • Sounder (disambiguation) — Sounder may refer to:* Sounder , a book by William H. Armstrong * Sounder (film) , a film based on the novel *Sounder, a group of wild boar, or of domestic pigs foraging in woodland (in other circumstances a group of domestic pigs is a herd).… …   Wikipedia

  • telegraph — [tel′ə graf΄] n. [Fr télégraphe: see TELE & GRAPH: orig. used of a semaphore] 1. Obs. any signaling apparatus 2. an apparatus or system that converts a coded message into electric impulses and sends it to a distant receiver: originally, Morse… …   English World dictionary

  • 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

  • telegraph — /ˈtɛləgræf / (say teluhgraf), / graf/ (say grahf) noun 1. an apparatus, system, or process for transmitting messages or signals to a distance, especially by means of an electrical device consisting essentially of a transmitting or sending… …  

  • sounder — Synonyms and related words: TelAutography, Teletype, Teletype network, Teletyping, barometer, closed circuit telegraphy, code, duplex telegraphy, electricity, facsimile telegraph, feeler, interrupter, key, multiplex telegraphy, news ticker, pilot …   Moby Thesaurus

  • Electrical telegraph — A printing electrical telegraph receiver, and a transmitter key at bottom right An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. The electromagnetic telegraph is a device… …   Wikipedia

  • Coherer — Metal filings coherer The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the twentieth century. Invented around 1890 by French scientist Édouard… …   Wikipedia

  • Thermionic emission — Closeup of the filament on a low pressure mercury gas discharge lamp showing white thermionic emission mix coating on the central portion of the coil. Typically made of a mixture of barium, strontium and calcium oxides, the coating is sputtered… …   Wikipedia

  • NBC Red Network — NBC Red Network/ NBC Radio Network Type Radio Network Country …   Wikipedia

  • military communication — Introduction       the transmission of information from reconnaissance and other units in contact with the enemy and the means for exercising command by the transmission of orders and instructions of commanders to their subordinates. As such, it… …   Universalium

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