ABSORPTION OF LIGHT IN GASEOUS MEDIA. 
4‘^I 
Table NIL 
T + cos^ 
1 + cos^ ( 
sec 4>- 
Zenith sky 
Sun 
X 10-8. 
Av. sky Observed 
^ ^ • Av.sky/SunxlO-8. 
47'3 
29° 4 
•969 
1-15 
67-0 
62-0 
56-1 
If-8 
69-2 
62-6 
122 
6ffi0 
90-() 
51-2 
47-9 
•945 
1-49 
59-0 
83-0 
129 
53-1 
74-7 
61-1 
137 
54-7 
64-5 
•999 
2-24 
56-0 
125 
185 
50-0 
112 
65 • 0 
308 
50-0 
00 
00 
•918 
5^15 
60-0 
284 
214 
53-8 
255 
60-6 
770 
54-5 
85-5 
•995 
12-75 
56-0 
710 
500^ 
50-0 
635 
Sky Radiation, Mount Wilson, September 8, and October 19, 1906. 
f. 
1 + cos^ 6 
_ 1 + cos^ ( 
av. 
sec f. 
Zenith sky 
Sun 
Av. sky T ^_g j Observed 
Sun • Av. sky/Sun X 10 8. 
2°7 
o 
20 
•953 
1*064 
82-0 
77-0 
71’8 
83-2 
78-0 
730 
78 
22 
30 
•894 
1-155 
SffiO 
79-0 
74-0 
87-0 
81-8 
76-6 
82 
83-9 
9ffi0 
23 
45 
•791 
1-414 
78-8 
88-4 
67 
73-4 
82-2 
79-0 
108 
32 
55 
•781 
1-743 
74-4 
102 
81 
69 0 
94 
83-9 
131 
23 
65 
• 658 
2-366 
78-8 
123 
93 
73-4 
114 
81-5 
301 
29 
80 
•642 
5-76 
76-0 
281 
116 
70-9 
262 
Sky Radiation, Mount Wilson, August 18, 1905. 
Averar/e Intensities of Sky liadiation. 
A. 
c, 
, Aug. 18, 1905. 
c, 
Sept. 8, 1906. 
C, 
average. 
Date. 
^/3. 
To 
V 1 
— y- i 
Po 1 
•40y. 
•342 
•263 
•356 
Aug. 18, 1905 
•0087 
-050 
•45 
i -265 
•180 
•230 
•50 
! -202 
•129 
•148 
Sept. 8, 1906 
•0059 
•033 
•60 
• 139 
•065 
•085 
•70 
•081 
•036 
•070 
Mean at 
Moiuit Wilson 
•80 
•051 
•024 
•043 
•0081 
•026 
•90 
i -046 
•020 
•036 
1-00 
•048 
•016 
•032 
• 
1-20 
! -045 
•014 
•028 
1-60 
-046 
•010 
•025 
A ttenuation Coefficients on Dates of Sky Observations. 
