Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 379
wall, and then send an impulse along the line byswinging the first ball against the second, this impulsewill be reflected backby the last ball strik-ing against the wall andbounding back againstits neighbor. In likemanner sound waves inthe air are reflected bywalls of buildings,moun-tain peaks,… … Fig. 249. GENERAL PRINCIPLES 357 cannon or gun, are made at either or both stations, and thetime that it takes for the sound to reach the other stationis carefully noted. The time at which the discharge tookplace is known to the observer at the second station eitherby the flash or by an electric…
Physics
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