The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 72
ay be re-produced at a distance;but this was not enoughfor the transmission ofspeech. Pitch is only oneof the characteristics ofsound, for besides it, soundhas quality or timbre, anddegrees of loudness ox in-tensity, which it was neces-sary to transmit before human speech could be… … Fig. 82 So PRACTICAL TELEPHONE HANDBOOK of the particles of water. Wave motion in air is caused bya movement of the particles of air backward and forwardin a line with the direction in which the wave progresses.Every different sound needs a different motion of the airparticles for its conveyance,…
Telephone
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