Tyndall, John, 1820-1893 · New York : Appleton · leaf 328
nt to slightly agitate the sensitive flameatr. The heated layer was then placed at such an anglethat the reflected portion of the sound was sent through asecond tin tube, a f (of the same dimensions as u a).Its action was rendered visible by causing a second sensi-tive flame placed at the end of… … pulse, became again violently agitated, and at the samemoment the sensitive flame at f, ceasing to be affected bythe echo, resumed its former tranquillity. Exactly the same action takes place when the luminousportion of a gas-flame is made the reflecting layer; but inthe experiments above described…
Sound
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