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Mechanical applicances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical mvements, powers and devices"; (1917)

Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing company · leaf 36

An illustration from Mechanical applicances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical mvements, powers and devices";, 1917, leaf 36
Transmission of power. 3i … 33. ACOUSTIC TELEPHONE. The mouthpiece, a, has a cen-tral aperture for the passage of sound waves to the diaphragm, cf whose edges are secured within arabbet of the mouthpiece. Thediaphragm is about 7 inches indiameter and is made of sprucewood, which possesses great sono-rousness combined with…

Mechanical movements

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