﻿123 



Mr. Clinton J. Davisson on the Posits 



every increase of temperature up to something over 1000 0.* 

 At this temperature the emission, though small, seemed fairly 



The 



steady, 



and the curves shown in fig. 2 were obtained. 

 Fig. 2. 













1 







\ 





i 



i 



5 



C' 



c 



i 







\ 



J — ~ 1 



magnetic field, in this case, was 2915 gausses, and the dis- 

 placement of the maximum on reversing the direction of the 

 field amounted to three turns of the screw. The complete 

 data appear on the top line in the following tabulation : — 



Barium Sulphate. 



v 



(volts). 



H 

 [gausses). 



320 

 320 



2915 

 2015 



d 



(cm.). 



1-275 

 1-275 



(cm.). 



(e/m) 



e.m. mi 

 grams 



its\ 



from chemical 

 data. 



0190 

 0-197 



64 



142 



The data on the second line are for the curves shown in 

 fig. 3, which were obtained from the same supply of barium 

 sulphate. 



* Note. — The temperature of the salt, being of no great importance in 

 these measurements, was judged from the colour of the hottest portion 

 of the strip. In some eases comparison was made with the colour of 

 the interior of an electric furnace whose temperature could be measured. 



