Tyndall, John, 1820-1893 · New York : Appleton · leaf 49
great distances with very little diminutionof intensity. Into one end of this tin tube, fifteen feetlong, I whisper in a manner quite inaudible to the peoplenearest to me, but a listener at the other end hears medistinctly. If a watch be placed at one end of the tube,a person at the other end hears… … It is not quite extinguished, but it is forcibly depressed.When two books, b b, Fig. 5, are clapped together, thecandle is blown out.1 You may here observe, in a roughway, the speed with which the sound-wave is propagated.The instant the clap is heard the flame is extinguished.I do not say that the…
Sound
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