Wellisch — Motion of Ions and Electrons throicgh Gases. 19 



Press 



V 



i 



i 



/ 



Freq. 



k. 



K, 



mm. 



volts 















1-66 



14-3 



4^18 



•52 



•540 



829^2 



551-4: 



1-22 



1-64 



14-3 



2-84 



•34 



•540 



85M 



568^2 



1-23* 



1-01 



9^03 



2-20 



•40 



•574 



851^7 



965 



r28 



•563 



5^00 



1^73 



•34 



•574 



836^5 



1781 



r32 



•416 



6^26 



1-506 



•46 



•584 



862^1 



1975 



1^08 



•321 



4-17 



1-84 



•60 



•585 



833^3 



3090 



1-31 



•151 



1-13 



1^05 



•155 



•565 



856-0 



7265 



1-44 



•052 



•55 



•298 



•068 



•565 



842-4 



18250 



1^25* 



•052 



M5 



•333 



•13V 



•565 



842-4 



19130 



1^31* 



* rt r= 8 volts {v. fig. 



Mean value of Ki : 1*27 

 for the other determinations a == 20. 



The mean value obtained for K^ at the higher pressures was 

 1^23 which is in sufficient agreement with the above vakies to 

 justify the conclusion that the nature of the positive ion is 

 independent of the pressure. 



The mobilities of both the positive and the negative ions in 

 CO2 and H2 were determiued over a wide range of pressui^es ; 

 there was no evidence in either gas of any systematic alteration 

 in the valne oi pk^ or pJi\ as the pressure was reduced. It was 

 deemed unnecessary to extend the determination for these 

 gases down to the low pressures employed in the case of air 

 inasmuch as it w^as apparent that tlie processes were entirely 

 similar ; for this reason the law j9^==:Const. was only verified 

 down to a pressure of 4"'''' in CO^ and 12™"* in H,. The mean 

 values of K for air, CO, and H^ were estimated from the 

 results obtained at the higher pressures where the observation 

 error is relatively small although the results at the lower pres- 

 sures showed good agreement. The values thus obtained are 

 as follows : 





Ki 



K, 



K./K, 



Air 



1-23 



1-93 



1^57 



CO, 



•73 



1-07 



V47 



H, 



5-11 



9^67 



r89 



The values of K refer as usual to the dry gas at atmospheric 

 pressures and are expressed in cm. /sec. per volt/cm. 



For each gas the value of K^ is less and that of K, is greater 

 than the valne usually assigned ; for the sake of comparison 



