A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 405
h.—An apparatus for theautomatic production of a visible tracing ofthe vibrations produced by any sound. Phonautographic apparatus consists essentiallyof devices by which the sound waves are causedto impart their to-and-fro movements to a dia-phragm, at the centre of which a pencil or tracingpoint… … Fig. 421. Scotts Phonautograph. vessel A, Fig. 421, with a diaphragm of parch-ment stretched tightly like a drumhead over itssmaller aperture B. A tracing point attached tothe centre of the diaphragm, traces a sinuousline on the surface of a soot-covered cylinder C,that is uniformly rotated under…
Electricity · Electrical engineering
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