Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 896
over one of the platinum plates. When thereforeany motion is given to the diaphragm, it is imme-diately followed by a corresponding pressure uponthe carbon, and by a change of resistance in thelatter. Any electro-magnet, properly fitted with aniron diaphragm, serves as a receiving instrument in…
Mechanical engineering -- Dictionaries
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