Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 331
en a regiment of soldiers passes from smooth ground to rough ploughed land. It is evident that the rate of marching over the rouo-h land should be less than over the smooth. Let the rates be 3 and 4 miles an hour, respectively. In the figure (Fig. 865) areshown the ranks of soldiersmoving forward… … BoughLand Fig. 365.—Illustrating how a change indirection of motion may be due tochange in speed. EXPLANATION OF REFRACTION BY MEANS OF WAVES 321 time later tliis rank reaches the position a b, part being onthe rougli and the rest still on the smooth ground. Next, itreadies the position c d, and…
Physics
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