342 



Mr. W. B. Haine 



s on 



chamber, the mobility of A is much reduced (20 per cent., 

 say), and at most only traces of lighter ions can be detected. 

 The values deduced from a large number of curves are 

 here tabulated'. Notation, as in previous paper : — 



Distance between plates, ^ = (1) 6*4 cm. 



(2) 4-2 cm. 

 E = reading of voltmeter at critical voltage = amplitude f^/2. 

 n = 50 alternations per sec. Mean temp. =15° C. 



Table I. 

 Positive Ion. 



Table II. 

 Negative Ion A. 



Press. 



E. 



u. 



I/* 



Press. 



: e. 



«. 



1/u. 



cm. 



volts. 



ciu./sec. 





cm. 



volts. 



cm. /sec. 





8-6 



65 



70-4 



•0142 



58-3 



440 



10-4 



0961 



13-8 



107 



42-8 



•0234 



*58-4 



413 



11-1 | 



0902 



184 



141 



31-7 



•0315 



60-6 



462 



9-9 



1010 



23-9 



182 



25-1 



•0399 



63-5 



480 



9-5 



1050 



26-3 



200 



22-8 



•0438 



*67-7 



468 



9-8 



1021 



35-7 



270 



16-9 



•0591 



68-4 



512 



8-9 



1120 



37-2 



282 



162 



•0617 



713 



229 



8-5 



J 171 



*45-8 



330 



13-8 



•0722 



*76-8 



506 



9-1 



1104 



*50 6 



365 



12-5 



•0798 



77*5 



251 



7-8 



1285 



51-5 



388 



11-8 



•0S48 











Mean value P x ?< = 804'7 



