Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 203
of re-peated echoes. Pig.189 represents themanner in which thesounds rebound, in suchsituations, as at 1, 2, 3, 4, from side to side. It is not necessary tliat the surfiice producing an echoshould be either hard or polished. It is oflen observed atsea that an echo proceeds from the surface of… … What condi-tions of surfaceare requisite toproduce a per-fect echo ? fiEFLECTION OF SOUND. 199 rejfuiar form. An irregular surface must break the echo ; and if the irregu-laricy be very cousiderable, there can be no distinct or audible reflection atall. i or tnia reason an echo is much less perfect…
Physics · Science · Technology
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