Mr Vincent, Experiments on Impact. 



343 



The values of e are plotted in Fig. 7. The stars are from 

 columns IX. and XL, while points from columns VIII. and XI. 

 are so nearly identical with the positions marked by stars that 

 they are not indicated. 



The values of e thus obtained show that e decreases^ as the 

 velocity of impact increases. The curve showing the relation of e 

 to u is convex towards the axis of u. 



Vel. at Impact in cms. a sec. 

 Fig. 8. 



Fig. 8 gives a series of experiments similar to those exhibited 

 in Figs. 6 and 7. 



6 = 1050, 

 p = 9*6 x 10 8 dynes per sq. cm. 



The time taken to make any dent is 



IT 



8Db 



= 1-5 x 10 -4 sees. 



Fig. 9 is drawn from a similar set of experiments. In this 

 case some smaller velocities of impact were employed. 



Vel. of Impact in cms. a sec. 

 Fig. 9. 



25—2 



