Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 63
ld with its handle A against somehard substance, is thrown into a state ofvibration, its branches B, B, alternately ap-proaching to and receding from each other.Each branch sets the particles of air inmotion, and a sound of a certain pitch isproduced. But this sound is very unequallyaudible in… … ELEMENTS OF ACOUSTICS. 55 sound becomes so faint as scarce-ly to be heard, the audible posi-tions of the ear being in planesEE and 0 0, perpendicularand parallel to the broader facesof the fork; the inaudible, inplanes Ef E and 0 0\ mak-ing with the first, angles of45°. Fig. 20. O o\ \ JS 2 \ [^ /…
Mechanics · Acoustics · Optics
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