Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 404
ars tobe surrounded by a belt varying in radius from 1 to H REINFORCEMENT BY REFLECTION. 381 miles from which the sound appears to be entirely absent.Thus, in moving directly from a station the sound isaudible for the distance of a mile, is then lost for aboutthe same distance, after which it is… … from tne mainland, with no surrounding objects to affectthe sound. General Duane is the only person, as far as I amaware, who has noticed this singular effect, and thethoroughness with which he has followed it up, strikinglydemonstrates his keenness and sagacity as an observer.He has offered no…
Sound
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