Tyndall, John, 1820-1893 · New York : Appleton · leaf 50
hrough air has been devised by my assistant. Thetwo ends 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 India-rubber ; at the other end is an arrangement for the strikingof a bell, c. Drawing back… … lever a b, and causes the hammer b to strike the bell.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…
Sound
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