The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action (1877)
Dolbear, A[mos] E[merson], 1837- [from old catalog] · Boston, Lee & Shepard; New York, C. T. Dillingham · leaf 87
lled moleculaisimply becausewe cannot meas-ure the ampli-tude of the mo-tion. We may, FIG. 9. then, roughly di-vide all bodies into two classes, as to their rela-tions to sound, — such as re-enforce it, and suchas distribute it: the fust depending upon the formof the body, as related to a… … LOVERS TELEGRAPH. 83 of this class. Two tin boxes are connected by astring passing through the middle of the bottomof each. When the string is stretched, and aperson speaks in one box, what is said can beheard by an ear applied at the other. If thespeaking-tubes be made about four inches…
Telephone
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