Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 126
a series of independent blows.He also found that the ear could receive as many as 4,800per second. When the limit is reached, silence ensues.But the limits are not the same for all individuals. Some ♦See Sec. 472. 116 ACOUSTICS. persons can hear sounds too acute for others to recognize. 411. The…
Physics
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