Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 208
d 4.5 inches X 1 inch.Cut a slit about one-sixteenth of an inch wide lengthwise and centrallythr&ugh the strip nearly from end to end. Place the slit across the page NATURE OI SOUND AND SOUND-WAVES. 191 just below Fig. 169, and draw the book along underneath in the directionof the arrow.… … Fig. 159. each air-particle moves a little to and fro in the direction in which thesouhd-waves travel, and comes back to its starting-point; but the conden-sations and rarefactions, represented by a group (half a wane-length) ofdots becoming alternately closer together or farther apart, are…
Physics
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