﻿Ionization hy Collision in Helium. 

 Table IV.— Pressure 2 mm. 



813 



d :... 



•2 



•4 



•6 



•7 





X=240 q 



2'40 



5-89 



171 



38-7 



a. = 4-2] 



yn 



237 



5-88 



18-0 



39-0 



(3=-U) 



Table V. — Pressure 1 mm. 



d 



•4 



•6 



•7 



•8 



•9 



1-0 





X = 200 q 



«=2-37) 



\» 



/3=-165j 



31 



4-9 



64 



9-0 



127 



20-4 



2-6 



4-6 



64 



90 



132 



225 



The preceding tables give results from which both aand/3 

 can be calculated with accuracy ; but for the low values of 



— /3 becomes very small, and in the following table only a 



has been found. The value of a can be found from the fact 



Table VI. 



d 



•4 



•6 



•8 



d. 





Pressure 8 mm. 



X= 80 



X=160 



24 



3-6 



61 



2-20 



67 



17-5 



49 



4-77 



Pressure 10 mm. 

 X=200 



94 



35-7 





5-60 



Pressure 25 mm. 

 X = 125 



X=250 



6-7 



127 





318 

 7-13 



72 



295 





that for small values of # the general equation for the current 

 reduces to nz=n Q e ad . The currents for two distances are 



