Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 59
to, sufficient to account for thedistinction of quality. § 48. To ascertain what length of wave corresponds to i^nsth of waye .. j? .. ! .,t . i ,, corresponding to our sensation ot a particular pitch, we must have the a certain pitchmeans of measuring the lengths of different waves. These… … siren; a small hollow tube A, before the end of whicha circular disc J5, pierc-ed with a number ofequal and equidistantholes arranged in thecircumference of a cir-cle concentric with theaxis ,of motion C, ismade to revolve. The tube through which the air passes is so situated that theholes in the…
Mechanics · Acoustics · Optics
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