Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 251
pro-duced in a space with twoparallel walls at no great dis-tance apart, the sound is re-flected from one to the other,and reaches the ear at regularand frequent intervals ; thatis, the repetition of the echoacts as a note. A modification of the sirenknown as Browns steam-horn^ in which… … Fig. 236 243. Bellows.— In acoustics a bellows is an apparatus by which windinstruments, such as the siren and organ-pipes, are worked. Between the 234 On Sound [243- four legs of a table there is a pair of bellows, S (fig. 236), which is workedby means of a pedal, P. D is a reservoir of flexible…
Physics
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