Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 289
he bubbleon the waves of sound corresponds exactly with the actionof a double convex glass lens upon the waves of light. And now for the complementary experiment. Throughnitrous oxide sound moves more slo-^ly than through air;hence the power of this gas to concentrate the sonorouswaves. Through… … whether this is the case. As before, by means of Plateausmixture, I blow a large bubble of hydrogen. At a (fig. 146)is our sounding reed, and at c our sensitive flame, thepressure being so regulated that the flame is throwninto violent agitation by the sound of the reed. I intro-duce the hydrogen…
Sound
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