﻿Motion of Electrons in Argon and hi Hydrogen. 103D 



from the plane of the electrodes, the upper curve corre- 

 sponding to the case where the centre of the stream falls 

 on the centre of E 2 {b = 0) and the lower carve where the 

 centre of the stream is one millimetre from the centre of 

 E 2 (/> = "1). The carves 2 give the value of 11 under the 

 same conditions, except that the slit is four centimetres from 

 the receiving electrodes. In each case the curves for b = 

 and b=-l are close together, and the correct ratio H for any 

 intermediate value of b is easily estimated. 



Fig-. 3. 



0-k 



oz 



0-2 



R 









J 



t ^^- : 



^^ 





















/ 

















/ 











z 4 







o-6 



/■6 



The method adopted for calculating the ratios R corre- 

 sponding to definite values of Z/k was similar to that used 

 by Mackie * to find the points on the curve 2 (6 = 0). 



In the coarse of the calculations we redetermined the 

 points on this curve and obtained numbers almost exactly 

 the same as those given by Mackie. 



The calculated values of R, from which the curves were 

 drawn, are given in Table I. 



Table I. 







R. 



z 



k 



•05 









C- 



--2. 



C =4. 



&=0. 



b--l. 



b=0. 





•196 



•195 



•1 



•231 



•230 



■1607 



•1602 



"2 



•29S 



•295 



•2077 



•2066 



•3 



•353 



•3-18 



•2495 



•2476 



•4 



•397 



■389 



— — 



•o 



•435 



•425 



•314 -310 



] 



— 



— 



•425 



•415 



15 



— 



— 



•506 



•490 



2 



— 







•570 



•548 



25 





— 



•619 



•590 



J. II. Mackie, Proc. Roy. Soc. A, xc. p. 69 (1914^ 



