Morse sounder

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• sounder — I. /ˈsaʊndə/ (say sownduh) noun 1. someone or something that makes a sound or noise, or sounds something. 2. History an instrument used in line telegraphy whereby incoming morse signals were converted from electrical pulses to sound, making them… …  

• 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

• Edouard Branly —     Edouard Branly     † Catholic Encyclopedia ► Edouard Branly     French physicist and inventor of the coherer employed in wireless telegraphy, born at Amiens, 23 October, 1846. After receiving his early education at the Lycée of St. Quentin,… …   Catholic encyclopedia

• 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

• Sonar — This article is about underwater sound propagation. For atmospheric sounding, see SODAR. For other uses, see Sonar (disambiguation) …   Wikipedia

• 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

• 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

• 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

• Station identification — (sometimes called a sounder or stinger ) is the practice of any type of radio or television station or network identifying itself, typically with a call sign or brand name. Over the air transmitters may be required to identify themselves… …   Wikipedia

• Instructograph — The Instructograph was a paper tape based machine used for the study of Morse code.The paper tape mechanism consisted of two reels which passed a paper tape across a reading device that actuated a set of contacts which changed state dependent on… …   Wikipedia

• Navigation — This article is about determination of position and direction on or above the surface of the earth. For other uses, see Navigation (disambiguation). Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. Navigation is the… …   Wikipedia