Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 34
s of a tin tube fifteen feet long are stopped bysheet india-rubber stretched across them. At one end, e,a hammer with a spring handle rests against the indiarubber ; at the other end is an arrangement for the strikingof a bell, c. Drawing back the hammer e to a distancemeasured on the graduated… … The rapidity of propagation is well illustrated here. Whenhydrogen (sent through the india-rubber tube h) is substi-tuted for air, the bell does not ring. The celebrated French philosopher, Biot, observed thetransmission of sound through the empty waterpipes ofParis, and found that he could hold a…
Sound
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