INTENSITY OE THE CHEMICAL ACTION OF TOTAL DAYLIGHT. 
66 
May 19th, 1873. 
Clock . 
Hand. 
Time. 
n. 
Mean 
reading. 
I . 
I 
n 
Time. 
ft. 
Mean 
reading. 
I . 
I 
n 
r 
h in 
10 30 A.M. < 
6-9 
9-6 
17-1 
20-2 
160 
151 
100 
84 
0-54 
0- 69 
1- 34 
1-49 
0-078 
0-072 
0-078 
0-074 
k m 
10 30 A.M. -j 
f 
25 
15 
10 
15 
73 
61 
149 
106 
1-59 
1-69 
0- 72 
1- 29 
0-064 
0-113 
0-072 
0-086 
Mean 
0-076 
Mean 
Diff. 
0-084 
-0-008 
11 30 „ | 
5- 3 
6- 9 
9-6 
127 
52 
48 
0- 95 
1- 78 
1-81 
0-177 
0-257 
0-188 
11 30 „ J 
J 
5 
10 
10 
148 
34 
41 
0- 74 
1- 94 
1-87 
0-148 
0-194 
0-187 
Mean 
0-207 
Mean 
Diff. 
0-176 
+ 0-031 
12 30 p.m. | 
20-2 
17-1 
9-6 
138 
155 
168 
0-84 
0-62 
0-37 
0-042 
0-036 
0-039 
12 30 p . m . j 
r 
20 
15 
142 
151 
0-80 
0-69 
0-040 
0-046 
Mean 
0-039 
Mean 
Diff. 
0-043 
-0-004 
1 30 „ | 
17-1 
10-2 
9-6 
98 
145 
152 
1-36 
0-77 
0-67 
0-079 
0-075 
0-070 
1 30 „ j 
j 
10 
10 
7 
141 
145 
146 
0-81 
0-77 
0-76 
0-081 
0-077 
0-108 
Mean 
0-075 
Mean 
Diff. 
0-089 
-0-014 
2 30 „ 
No obse 
rvations. 
2 30 „ 
Noobse 
rvations. 
3 30 „ | 
17-1 
10-2 
9-6 
6-9 
92 
145 
135 
152 
1-42 
0-77 
0-87 
0-67 
0-083 
0-075 
0-090 
0-097 
3 30 „ j 
1 
10 
15 
10 
135 
126 
150 
0-87 
0-96 
0-70 
0-087 
0-064 
0-070 
Mean 
0-083 
Mean 
Diff. 
0-074 
+ 0-009 
4 30 „ | 
9-6 
17-1 
20-2 
162 
152 
140 
0-49 
0-67 
0-82 
0-051 
0-039 
0-040 
4 30 „ j 
r 
15 
20 
25 
156 
146 
128 
0-61 
0-76 
0-94 
0-041 
0-038 
0-038 
Mean 
0-043 
Mean 
Diff. 
0-039 
+ 0-004 
5 30 „ | 
31-7 
20-2 
126 
155 
0-96 
0-62 
0-030 
0-030 
5 30 „ - 
30 
20 
30 
146 
159 
131 
0-76 
0-56 
0-91 
0-025 
0-028 
0-030 
Mean 
0-030 
Mean 
Diff. 
0-028 
+ 0-002 
