742 



Mr* A. E. Garrett on Electrical 



iodide and lead iodide, on the other hand, do not become 

 loaded in this manner. 



The cadmium iodide, which does not absorb moisture, gives 

 off positive ions which move with a velocity just about 

 double that of the positive ions from lead iodide or bismuth 

 iodide. 



Fig. 4. 



'90' 



70 



60 



j,50 



1 = 



1 



40 



$J0 



^20 

























































/k 













/x 



J 







/> 



/ / 



c/ 







s 





sfs 











X 



f\-CflDn 

 B =Z//vc 

 C = Leal 

 D = B/s/v, 



HUM /OD/DE 



/ODIDE 

 ) /ODIDE 

 UTH /OD/DL 



fSSmrn.p 



( /O 771771 

 (/077177V 

 -(/077Z77V. 



ressure) 



- ; 



• ; 



185 190 



Temperatures C. 



195 



800 



?05 



210 



215 



The influence of pressure upon the velocity of the ions can 

 be seen by comparing the products obtained of velocity and 

 pressure as given in the last column of the table. These are 



