Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 331
appen when a regimentof soldiers passes from smooth ground to rough ploughedland. It is evident that therate of marching over the roughland should be less than overthe smooth. Let the rates be 3and 4 miles an hour, respectively. In the figure (Fig. 365) areshown the ranks of soldiersmoving forward… … BouqhLand Pig. 365.—Illustrating how a change indirection of motion may be due tochange in speed. EXPLANATION OF REFRACTION BY MEANS OF WAVKS 321 time later this i-aiik reaches the position a h, part being onthe rough and tlie rest still on the smootli ground. Next, itreaches the position c d, and…
Physics
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