American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 413
THEORY OF TELEPHONE. In the act of speaking, air vibrations are set up by the voice. These vibrations con-sist of to and fro motions of the air particles, which vibrations so act upon the earnerves as to produce the sensation of hearing. The electrical telephone consists of a transmitter, by means…
Telegraph
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