Tyndall, John, 1820-1893 · New York : Appleton · leaf 428
Pse 184. 2:8. Fig. 185. 8:4 … 420 SOUND. obtained by Mr. Hubert Airy with a compound pendulum.The experiments are described in Nature for August 17and September 7, 1S71. As their loops indicate, thefigures are those of an octave, and a twelfth. But the most instructive apparatus for the compound-ing of rectangular vibrations is…
Sound
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