Specific Charge of the Ions emitted by Hot Bodies, 547 

 Platinum, Positive Ions. 



Distance 



Magnetic 





Deflexion 



e/m 

 (E.M. units). 



between 

 plates z (cms.). 



Intensity H 

 (lines per cm.). 



Volts V. 



of Ions w 

 (1-0635 cm.). 



•452 



4850 



82 



1-35 



275 



•452 



4850 



158 



•95 



262 



•452 



4850 



320 



•65 



250 



•452 



4475 



200 



•75 



244 



•452 



4200 



82 



TOO 



202 



•452 



3175 



83 



•885 



273 



•473 



4850 



119 



110 



222 



•473 



4850 



80 



1-37 



233 



•473 



4850 



147 



100 



227 





Average values 



... e/w=243, m/K=S9-8. 





being completely satisfied. It was pointed out that a check 

 on this uncertainty could be obtained by determining the 

 value of e\m for the negative electrons which are emitted at 

 somewhat higher temperatures. The value of this quantity 

 is known to be very near 1*88 x 10 7 , so that a determination 

 of the experimental value will enable us to determine the 

 correction factor which has to be applied in order to get the 

 true value for the positive ions. In making this correction 

 we assume that the factor is the same for the positive as for 

 the negative ions. There seems to be no reason why this 

 should not be very nearly the case. 



The results of the measurements for the negative electrons 

 from hot platinum are given in the following table. The 

 units in this and all succeeding tables are the same as in the 

 preceding table except where the contrary is stated. 



Platinum. 



Negative Ions. 



z. 



H. 



Y. 



X. 



e/m. 



•443 



28-75 - 



74 



1-65 



1-15 XlO 7 



•443 



28-75 



164 



1-10 



1-13 



•443 



142 



41 



•95 



•86 



•443 



14-2 



41 



1-00 



•96 



•473 



142 



41 



1-225 



1-11 



•473 



14-2 



81 



•975 



1-38 



•473 



142 



123 



•775 



1-33 



•473 



14-2 



41 



1-40 



1-44 



•473 



142 



41 



1-33 



1-30 





Average value ... e/m= 



:1-18X10 7 . 





2 2 



