Mr Vincent, Experiments on Impact. 



355 



the rest being about 30 x 30 x 15 c.cms. in volume. The values 

 of p and t calculated from these curves are given below : — 



From this table we see that though p is less than in the case 

 of lead, it is of the same order of magnitude. For same height 

 of fall and with balls of one material d varies with D as is shown 

 in the following table : — 



Coefficient of Restitution for Steel Spheres impinging on Paraffin, 

 Brass, and Cast-iron. 



Experiments on the value of e for a steel ball and paraffin, 

 brass, and cast-iron blocks were performed. The results are set 



Vel. of impact in cms. a sec. 

 Fig. 16, 



