Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 40
nctly heard to strike the water. Shout- EEFRACTIOX OF SOUXD. 19 ing or coughing into this well produces a resonant ring ofsome duration.^ § 6. Refraction of Sound. Another important analogy between sound and lighthas been established by ]M. Sondhauss.^ A large lenscompels the solar rays that fall… … passing through the glass. Sound may be similarly re-fracted by causing it to pass through a lens which retardsits motion. Such a lens is formed when a thin balloon,which yields readily to the pulses striking against it, isfilled with some gas heavier than air. A collodion, or athin india-rubber…
Sound
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
![An illustration from One thousand processes in manufactures and experiments in chemistry / [Colin Mackenzie]. (1825)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b29307867-135-1.webp)
