Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 339
roar, shortening and lengthening as the succes-sive sound-pulses reached it. The gases were then ad-mitted. Twenty-five flat jets of coal-gas ascended fromthe tubes below, and twenty-five cascades of carbonicacid fell from the tubes above. That which had been ahomogeneous medium had now fifty… … GASES AND VAPOURS EFFECTIVE. 317 the flame could pierce the clear, optically-transparent,but acoustically-opaque atmosphere in the tunnel. Solong as the gases continued to flow the flame remainedperfectly tranquil. When the supply was cut off, thegases rapidly diffused into the air. The atmosphere…
Sound
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