ON’ THE EFFECTIVE TEMPERATUPtE OF THE SUN. 
389 
Date : September 4th, 1893. 
Weather : Hazy clouds, with intervals of light blue sky ; Wind S.S.E., moderate. 
Position. 
Local 
time. 
Bal 
Beading. 
ance. 
Temp. abs. 
Snn’s 
altitude. 
Per cent, 
trails. 
Angle of 
incidence. 
Per cent, 
reflected. 
Sun’s abs. 
temp. 
h. 
m. 
O 
O 
O 
O 
lA 
10 
54 
67-6 
1514 
41-8 
64-0 
61-0 
9-4 
7003 
10 
56 
67-2 
1508 
41-8 
64-0 
61-0 
9-4 
6975 
10 
57 
69-0 
1539 
41-8 
640 
61-0 
9-4 
7119 
11 
35 
71-2 
1581 
43-0 
64-3 
63-6 
Il-O 
7022 
11 
36 
71'2 
1581 
43-0 
64-3 
63-6 
11-0 
7022 
11 
37 
72-0 
1594 
43-0 
64-3 
63-6 
110 
7053 
Mean . 
7032 
IB 
11 
10 
53-2 
12.54 
42-6 
64-0 
62-2 
10-1 
5697 
11 
27 
53-3 
1256 
42-5 
64-0 
62-2 
10-1 
5706 
11 
28 
53-3 
1256 
42 5 
64-0 
62-2 
10-1 
5706 
11 
43 
54-0 
1268 
43-2 
64-3 
63-8 
11-0 
5632 
11 
51 
54-0 
1268 
43-2 
64-3 
63-8 
11-0 
5632 
11 
53 
54-2 
1273 
43-2 
64-3 
63-8 
ll-O 
5654 
Mean . 
5671 
Note.— Balance readings refer to Calibration-line 3. 
