of the Selenium Cell. 
Coprrr-Sniunipn Onur, 
H.M.F. 12 volts ; 
Res. = 2°3 x 10° ohms. 
\. 
Wave- 
length. 
ph. 
a Become 
Ti 2 Se 
SO eas 
OD ee se 
LONE. cctewt 
470 Se ae 
s/f Rear 
716 
BD renee 
“yi 
1:28 
2:35 

3:08 ...... 
A, 
Galv. defl., 
cell in 
| dark. 
mins, 
260 



B. B 
Inereased | A’ 
Galv. defl., | Sensi- 
cell bility. 
exposed, 
mms. 
26 ‘10 
29 ob 
39 "15 
67 96, | 
112 43 | 
130 ‘DO 
101 39 
60 23 
10 ‘04 
5 02 
() ‘00 
0 ‘O00 
() ‘00 


TABLE I, 
Maurcury-Saupytpn Onin, 
E.M.F. 8 volts; 
Res. = 2:2 x 10° ohms. 
A, 
Galv. defl., 
cell in 
dark. 
oe es 
mins. 
180 

B. 
Increased 
Galv. defl., 
cell 
exposed. 
mms. 
22 
23 
27 
47 
85 
95 
61 
26 
6 

B 
A 
Sensi- 
bility. 
12 
13 
15 
"26 
‘47 
D3 
4 
‘14 
‘O04 
02 
00 
‘O00 
‘00 




Lrap-Snuentpn Cnn. 
E.M.F. 4 volts ; 
Res. = 
A. 
Galy. defl., 
cell in 
dark, 
mms, 
220 
” 



‘5 107 ohms. 
B. B 
TInereased % 
Galv. defl., | Sensi- 
cell bility. 
exposed, 
mms. 
24 “Tt 
26 "12 
35 ‘16 
63 "29 
102 “46 
tai “HO 
74 «| +84 
30 ‘14 
8 ‘O4 
3 ‘Ol 
1 ‘O00 
0 ‘O00 
Q ‘00 


SILVER-SHLENIDE Ontt. 
E.M.F. 4 volts ; 
NG 
Galv. defl., 
cell in 
dark. 
mms. 
150 
” 
” 
” 
” 
” 
”» 
| 

Res. = 1°3 x 10° ohms. 
B. 
Increased 
Galy. defl., 
cell 
exposed, 

mms. 
33 
37 
5b 
107 
230 
340 
270 
125 
30 
12 
2 
0 
) 
* Tn the final plotting of results these quantities, as ordinates, were given but one-fourth of their full value. 

B 
A 
Sensi- | 

bility. 
| 
| 
22 * 
25 * 
Phil. Mag. S. 6. Vol. 7. No. 37. Jan. 1904. 
