Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 76
pulses in the air which blend to a continuousmusical note, audible to you all. Mark how the notevaries. When the whirling table is turned rapidly thesound is shrill; when its motion is slackened the pitchimmediately falls. If instead of a single glass tube therewere two of them, as far apart as two… … a puff through two holes at the same time. The intensityof the sound would be thereby augmented, but the pitchwould remain unchanged. The two puffs issuing at thesame instant would act in concert, and produce a greatereffect than one upon the ear. And if instead of two tubeswe had ten of them, or…
Sound
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