Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 172
silk-covered copper wire, the ends of which are con-nected by means of the terminals, hh, with the line LS.The mouthpiece, VV, is fastened by means of two screws,ff, to the projecting flange, UU, of the case, and holds thevibrating diaphragm in position. This diaphragm is madeof a ferrotype plate… … Fig. 47-first made by Bell, except that the harp, which can onlyproduce a limited number of definite notes, is replacedby the steel diaphragm, which reproduces with more orless clearness all the notes which go to make up thehuman voice. As in the former instrument, no battery is required,the…
Electric industries · Electricity
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