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 67
nopposite directions at the sametime. Look at the physicalcondition of the air in front ofone of these prongs. As theFIG- 6- latter strikes outwards, the air in front of it will be driven outwards, condensed;and, on account of the- elasticity of the air, thecondensation will at once start to travel… … 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…
Telephone
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