carbon transmitter
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Carbon transmitter — A telephone transmitter in which a carbon contact is used. [Webster 1913 Suppl.] … The Collaborative International Dictionary of English
Carbon microphone — The carbon microphone, also known as a carbon button microphone (or sometimes just a button microphone) or a carbon transmitter, is a sound to electrical signal transducer consisting of two metal plates separated by granules of carbon. One plate… … Wikipedia
carbon microphone — noun : a microphone whose operation depends on the alteration of the electrical resistance of carbon contacts * * * carbon microphone noun A microphone in which variations in sound pressure produced in a diaphragm are detected in a current… … Useful english dictionary
Spark-gap transmitter — A spark gap transmitter is a device for generating radio frequency electromagnetic waves. These devices served as the transmitters for most wireless telegraphy systems for the first three decades of radio (1887 ndash;1916) and the first… … Wikipedia
telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… … Universalium
Telephone — The telephone (from the el. τῆλε, tēle , far and φωνή, phōnē , voice ) is a telecommunications device that is used to transmit and receive sound (most commonly speech), usually two people conversing but occasionally three or more. It is one of… … Wikipedia
Invention of the telephone — The modern telephone is the result of work done by many people, all worthy of recognition of their contributions to the field. Alexander Graham Bell was the first to patent the telephone, an apparatus for transmitting vocal or other sounds… … Wikipedia
History of the telephone — The history of the telephone chronicles the development of electrical technology that enabled bidirectional human speech conversations over distances farther than a person could shout.Telephone prehistoryMechanical devicesBefore the invention of… … Wikipedia
Timeline of the telephone — Below is a Timeline of the telephone that covers important dates in the history of the telephone.1844 to 1875*1844 Innocenzo Manzetti first mooted the idea of a “speaking telegraph” (telephone). *1849 Antonio Meucci demonstrates a communicating… … Wikipedia
Edison, Thomas Alva — born Feb. 11, 1847, Milan, Ohio, U.S. died Oct. 18, 1931, West Orange, N.J. U.S. inventor. He had very little formal schooling. He set up a laboratory in his father s basement at age 10; at 12 he was earning money selling newspapers and candy on… … Universalium
