Tyndall, John, 1820-1893 · New York, Collier · leaf 400
laced at a or ft, or at c or c?, the sound isheard. Along the four dotted lines, on the contrary, thewaves generated by the two prongs completely neutralizeeach other, and nothing is there heard. These lines havebeen proved by Weber to be hyperbolic curves; and thismust be their character according… … Fio. 161. by means of resonance. Bringing a vibrating fork overa jar which resounds to it, and causing the fork to rotateslowly, in four positions we have a loud resonance; infour others absolutesilence, alternate risingsand fallings of the soundaccompanying the forksrotation. While the forkis over…
Sound
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