CHAPTER VI. 



THE RELATION OF THE CHARGE IN A CORPUSCLE TO ITS 

 MASS: How IMPORTANT IT is. 



THE value, -, is a most important one in the elucida- 

 tion of the nature of corpuscles. By it is meant simply 

 the ratio of the electrical charge on the corpuscle, e, to its 

 mass, m; and it is evident that, having obtained this value, 

 we need only determine the electrical charge to know the 

 mass of the corpuscle; that is to say, the amount of mat- 

 ter of which it is composed. 



It is easy to obtain the value of - from our equations, 



(1) RH^ , and (2) v=. For, substituting v in the 



first equation for the value of v in the second equation, we 

 have, 



, 2V 

 m X ~ 



Hence, 



2V 



And since V, R and H are known, there is no more diffi- 

 culty the problem is solved. On the basis of the experi- 



ment, ^=10,000,000. Hence, m 1Q QQ ^ QaQ . So that 



all we have now to do is to determine the charge on the cor- 

 puscle and divide it by 10,000,000 to obtain the mass of 

 the corpuscle. 



(61) 



