Rosenlaui, 4tli July, 1887. 
OF SUNLIGHT THROUGH THE BARTH’S ATMOSPHERE. 
35 
o 
CC' 
CD 
O 
■TS 
o 
o 
o 
o 
c CO 
^ o 
r 
Calculated 
intensity. 
891 
S'^l 
86 
. 
Adopted 
mean 
intensity 
for 10 sec. 
exposure. 
98 
143 
163 
Intensity 
for 10 sec. 
exposui’e. 
o ^ lo' ^ CO o do” o CO 
OOOi OO^'^ COCDCOCO 
i-H rH rH t—i r—* i—I 
1 
Equivalent 
in 
intensity. 
50 
100 
190 
92 
140 
280 
94 
160 
250 
.326 
Depth of 
tint. 
White 
= ■100. 
72 
50 
32 
53 
39 
23 
52 
36-5 
25-5 
19-2 
Air 
thickness, 
that of ZD 
being 1. 
2-19 
1-4 
1-02 
CD 
CD O “ 
^ o 
^ 
a w o 
- w d 
g TH 
c3 
cq 
f^. 
wt) 
<i> 
0) 
a 
o 
00 
lO 
O -M 
^ Q a 
^ ^ g 
was 
iO O iO o 
^ I—i r^q 
C 
d 
tn 
o 
<x> 
r^ 05 CO 
Tp lO CO 
IN. 00 o 
F 2 
