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 897
it,will reproduce the sounds. In this transmitter, a membrane of parchment paper is vibrated by thesound-waves, but a metallic sheet or a membrane of wood may be used. In the centre of the mem-brane A B is fixed a piece of metal CD, the lower end of which has the form of a flat piston, andrests…
Mechanical engineering -- Dictionaries
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