i6 



L. G. Raub 



The results in Table III were taken immediately after filling 

 the apparatus from the argon bulb. They show an excellent 

 agreement between the observed and calculated potentials, sub- 



/^s 



./(, ./S -^o 



J I I I I I I 



.30 

 Fig. 8 



yo C/^ 



stantiating the theory very satisfactorily. None of the values 

 could be considered unsatisfactory except one or two at the dis- 

 tance .18 cm., the edge of the polarization region, where the ob- 

 served values of the potential are markedly lower than the com- 

 puted values. As explained previously, this is believed to be due 

 to the setting of the probe slightly too close to the cathode. 



The values of the mobility computed from these data are in fair 



