Nolan — Ionic Mohilities in Air and Hydrogen. 



85 



of mobility 7'93 and a subordinate gronp of mobility 677. Curve D gives 

 ions of mobilities 9-4, 11*0, and 15 0, the latter being the fastest ion present. 

 Most of these mobilities have been obtained many times under the conditions 

 described. It is believed that the values deduced from the curves just given 





















1 





















1 



1 



1 

 1 



1 

















^i 



1 



















d 



1 















{ 



/ 



/ 



/ 















/ 



y 



/ 















y 



^ 



X 









1 e— 



„--^ 



--^ 



^ 











Vo/^S 





Fig. 5. 



are fairly accurate and a good average representation of the results obtained 

 as a whole. All these results were obtained at a pressure of 75'6 cms. and 

 temperature 19° C. The values are collected in the following table and 

 compared with mobility values found by Haines for negative ions : — 



Negative ions 

 (Haines). 



Positire ions 

 (Nolan). 



Eemabks. 



15-9 



15-0 



— 



— 



11-0 



— 



9-2 



9-4 



— 



7-9 



7-93 



Mobility well esiaWished. 



— 



6-77 



Three other observations approx. 7'0. 



— 



6-15 



Mobility well established. 



— 



5-68 



Some observations tend towards 5'9. 



5-4 



5-23 



Mobility well established. 



