A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 429
ore the explosion. In thisway a condensation and a rarefaction—in fact, a series ofthem—move outward in all directions from the explodedballoon. A single condensation and its accompanying rare-faction together constitute a sound-wave. The sound-waves produced by a body in mid-air giving 404… … FIG. 220. FIG. 221. 325. Analysis of Sound-waves.—In seeking to form adistinct idea of the motions of particles through which asound-wave is moving the student will be greatly assisted bythe use of Crovas disk (No. LXXXVII). This consists(Fig. 221) of a number of circles drawn so as to be nearlybut…
Physics
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