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 68
CONSTITUTION OF A .SOUND-WAVE. 63 ance we call rarefaction moves in air with thesame velocity as a condensation. We musttherefore remember, that just behind the wave ofcondensation is the wave of rarefaction, bothtravelling with the same velocity, and thereforealways maintaining the same relative… … FIG. 7. each other. Now, the fork vibrates a great manytimes in a second, and will consequently generateas many of these waves, all of them constitutedalike, and having the same length ; by lengthmeaning the sum of the thicknesses of the con-densation and the rarefaction. Suppose a fork tomake one…
Telephone
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