INTENSITY OF CORONAL LIGHT DURING THE SOLAR ECLIPSE OF 1886. 377 
Table III.—Readings on the Equatorial Photometer reduced to the Values of 
Light Intensity. 
I. 
II. 
III. 
IV. 
V. 
I 
1-55 
15-8 
•070 
seconds. 
10 
2 
2-66 
18-3 
•0.33 
20 
.3 
366 
20-3 
•019 
30 
4 
1-61 
16-5 
•058 
40 
5 
2-55 
17-5 
•043 
50 
6 
3 44 
19-4 
•024 
60 
7 
1-25 
19-8 
•021 
70 
8 
216 
21'4 
•012 
80 
9 
2-60 
24-0 
•005 
90 
10 
111 
18-0 
•036 
100 
11 
2-16 
21-5 
•013 
110 
12 
3-16 
23-5 
•005 
120 
13 
2-16 
23-0 
•007 
130 
14 
2-33 
23-5 
•005 
140 
15 
2-33 
23-5 
•005 
150 
Fig. 6 shows the position of the several spots as seen on the photometer screen. 
The arrow and shaded segments show the apparent direction of the Moon’s jDath 
across the Solar disc. 
The numbers correspond with the order in which the readings were made. 
Table IV. gives the value of Lieutenant Douglas’s readings, and Table V. those of 
liieutenant Bairnsfather. It must be remembered that Lieutenant Douglas’s 
instrument measured the total light from the corona with only a small portion of the 
light from the sky, whereas the bar photometer as used by Lieutenant Bairnsfather 
measured the light from the corona together with that from a large portion of the 
MDCCCLXXXIX.—A. 3 C 
