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 106
andallowed the spring to fly back against the button,to complete the circuit and reproduce the sameseries of changes. The rapidity with which thecurrent may be broken in this way is only limitedby the strength of both spring and current. The MAGNETIC SOUNDS. 101 greater the tension of the spring… … dently give 256 clicks per second, which wouldhave the pitch of C. When these clicks areproduced in the rod held in the hand, thesound is hardly perceptible, being like that of asounding tuning-fork when held thus. In orderto strengthen it, it is necessary to place it onsome resonant surface. It is…
Telephone
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