Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 122
s repeatedseveral times. This may be produced in several ways, andeach is known as a multiplied echo. 393. First. A multiplied echo may arise by reflectionfrom objects at different distances. Thus Echo Lake, inthe White Mountains of New Hampshire, repeats a sound,as the explosion of a cannon, four… … Fig. 138. Fig. 138 shows how this is produced. If the sound be made atA, it will be reflected at B, a second time at C, a third time at D,and so on until the sound is lost by the repeated reflections. Anobserver placed in either of these lines or in others similarly situ-ated, would hear the sound.…
Physics
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