Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 182
ard it condenses the air before it, and on its returnthe air is rarefied. With each complete vibration a wave ofcondensation and rarefaction is produced, and during that time AN AIR-WAVE ENCIRCLING THE EARTH 171 the sound will have travelled one wave-length, I. If the stripvibrates n times a second… … Illustrating the transraission of sound in sphericalwaves. Fig. 202.—As the strip vibrates the air is alternately condensed and rarefied. illustrated in Fig. 203, where spherical waves move out fromthe sounding bell as their centre.195. An Air-Wave Encircling the Earth. A wonderful example of the…
Physics
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