A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 377
of carbon E, pointedat both ends, is inserted in holes near the ends of-cross-pieces of carbon B and C. The thin uprightboard A, on which these are supported, acts as a sounding board or diaphragm, and its movementsby sound waves are at once audible to a personlistening at the receiving telephone.… … Fig. 3Q7- Microphone. Microphone Relay.—(See Relay, Micro-phone?) Micro-Seismograph.—(See Seismograph,Micro?) Microtasimeter.—An apparatus inventedby Edison to measure minute differences oftemperature, or of moisture, by the resultingdifferences of pressure. A change of temperature, or moisture, is…
Electricity · Electrical engineering
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