Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 118
s-tinctly heard by theFis-133. ear placed at the other focus. But when the ear was removed from the focus,the ticking was scarcely audible. That is, the lens hadconverged the sound waves to a focus. 379. This proof of refraction receives additional confir-mation by placing a balloon filled with… … LAWS OF REFLECTION. 109 Section II.—Reflection of Sound. 380. When a moving elastic body strikes the surface ofanother body, it is compressed, and it also compresses thebody with which it comes in contact. But elasticity atonce causes both to return to their original shape, thussending the moving…
Physics
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