Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 82
e center of the back plate a soft rubber tube, r, is fixed which is 60 AMERICAN TELElHONU PRACTICE. of sufficient length to make contact with the diaphragm, its functionbeing that of a damper to the vibrations of the diaphragm. Themouthpiece, M, is so ctirved as to conduct the sound waves… … FIG. 4.J.-SECTI0NAL VIEW OF SnLID-n.\CK TR.\NSMITTER. The White, or solid back, transmitter, as it is called, is shownin Figs. 45 and 46, the latter giving a clear idea of the constructionof the working parts. Fig. 45 shows the section of the completeinstrument. The sections of the bridge piece. P,…
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