Tyndall, John, 1820-1893 · New York : Appleton · leaf 56
r. Shouting or coughing into this wellproduces a resonant ring of some duration.1 § 6. Refraction of Sound.Another important analogy between sound and lighthas been established by M. Sondhauss.2 When a largelens is placed in front of our lamp, the lens compels therays of light that fall upon it to… … through the glass. Sound maybe similarly refracted bycausing it to pass through a lens which retards its motion.Such a lens is formed when we fill a thin balloon withsome gas heavier than air. A collodion balloon, u, Fig.10, filled with carbonic-acid gas, the envelope being so 1 Placing himself…
Sound
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