Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 290
ong as the bubble is in front of the reed.This effect is due to the divergence of the waves of ACTIOX OF SOUXD LEXSES OX FLAME. 267 sound. The action is precisely similar to that of a doubleconcave lens upon the waves of light. The sound lenses here employed are without wrinklesor corrugations of… … chosen in preference to carbonic acid, because the lattergas rapidly disintegrates the film and causes the bubbleto burst. I may add that collodion balloons also make,with nitrous oxide and hydrogen, excellent lenses. In the foregoing illustrations /, as before, representsa funnel the shank of…
Sound
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