[satterly] the pendulum 35 



Then Mu+MiUi = 30-5 x 22-5+9-9 x = 687 



Mv+MiVi = 30-5x 13 -6+9 -9x27 -3 =415 +270 = 685 

 therefore the momenta are equal. 



27-3-13-6 13-7 

 Also e = = = -61 



22-5 22-5 



In a second experiment the little ball was drawn back 27-3 

 inches, and the big ball left hanging at rest. After the collision the 

 big one went forward 11-0 inches and the little one rebounded 5-7 

 inches. 



Then Mu+MiUi = 30-5 x 0+9-9 x 27 -3 = 270 



and Mv+MiVi = 30-5xllO-9-9x 5-7 = 336-57 = 279 

 therefore the momenta are practically equal. 

 11-0+5-7 16-7 



^^'"" = -tT^ = ^3 = -61 as before 



In a third experiment both balls were drawn back and released 

 at the same moment. They collided in their lowest positions and 

 the results obtained confirmed the laws. 



It is plain from the above description that the experiment is very 

 instructive and needs only simple apparatus. These are two worthy 

 commendations . 



