Pi koto- Electric Effect of some Compounds, 



383 



being approximately 10~ 15 amp. The sign <r indicates that 

 there was no leak, and the number which follows gives the 

 leak which could have been detected. 



Mercurous Iodide. 



Leak. 



First exposure. (First 40 sees.) .... = 11 



Exposed 5 mins 48 



In dark 5 ,, 36 



Exposed 5 „ 69 



In dark 25 „ 71 



Exposed 3 ,, 85 



Exposed 15 „ 110 



In dark 15 „ 103 



Exposed 7 ,, 170 



Mercuric Iodide. 



f First 20 sees. 

 First exposures . . \ Next 20 „ 



[Next 15 „ 



In dark 5 mins 



Exposed 3 ,, 



Exposed 3 „ 



In dark 9 ,, 



Exposed 3 „ 



Leak. 

 7'2 

 11-8 

 17-7 

 21-1 

 63 

 87 

 80 



120 



Mercurous Chloride. 



Leak. 



f < First 20 sees. ] = <-7 



First exposures . . -J Next 60 „ I 3*5 



( Next 60 „ J 5-7 



Exposed 5 mins 26*4 



Exposed 5 ,, . 40*5 



Iu dark 6 ,, 40'5 



In dark 10 „ 35-0 



Exposed 4 „ 53-7 



Exposed 6 „ 70*4 



Another layer was distilled but was not exposed to the 

 light until 15 hours later. The effect in the first 20 seconds 

 was < 1. As before, the leak increased on exposure of the 

 surface to the light. This experiment shows that the increase 

 in the leak depends upon the exposure to the light and not on 

 the age of the surface. 



