The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 381
lectrodes. Micron. A unit of length. It is one-millionth of a meter orfour one-huudred-thousandths of an inch. Microphone. An apparatus which includes a contact of variableresistance ; such resistance can be varied in amount by slight vibra-tions, such as those produced by sound waves. The… … Fig. 241. Methven Screen STANDARD BIvECTRICAIy DICTIONARY. 377 by the telephone corresponding to such changes. If the microphoneis spoken to, the telephone will emit corresponding sounds, repro-ducing the voice. It has been found in practice that carbon gives the best micro-phone contact. One of…
Electricity
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