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
ch other. Attached to brackets on the poles are twocoils Hand H, opposite to which are the two diaphragms D and D; and between them is a centralmouth-piece T, opening into a chamber in which the pulsations of the air in talking act upon the dia-phragm through lateral openings. The coils are…
Mechanical engineering -- Dictionaries
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