THROWING ROUND A CORNER. 



as a constant force, driving the ball away from 

 its original direction, and this produces an 

 effect so serious that riflemen have to make 

 the most careful allowance for it. 



H 



N 



T 



FIG. 12. DEFLECTION OF BALLS FROM THEIR COURSE. 



These are outside forces. Can any force 

 be impressed upon the ball itself that will take 

 it definitely out of the direction in which it 

 starts ? This also is possible, and is accom- 

 plished by giving the ball a certain spin. The 

 effect is most commonly seen in the games 

 of cricket, lawn-tennis, and baseball. 



43 



