388 
lilESSES. W. E. WILSOX AND P. L. GRAY 
In tlie 3rd column, the readings on the meldometer scale at the moment of balance. 
,, 4th ,, the absolute temperature corresponding to this reading, 
.'ith ,, the sun’s altitude. 
„ 6th ,, the percentage of transmission of the total solar heat through 
the earth’s atmosphere. 
,, 7th ,, the angle of incidence of the sunlight on the mu’ror of the 
heliostat, 
,, 8 th ,, the percentage reflection of the heat in the incident beam. 
,, 9th ,, the absolute temperature of the sun as calculated from each 
single observation. 
Date : September 3rd, 1893. 
Weather : Passing clouds. Sky, no perceptible haze. Barometer, 30'2 in. 
Balance. 
Position. 
Local 
Sun’s 
Per cent. 
Angle of 
Per cent. 
Sun’s abs. 
time. 
altitude. 
trail s. 
incidence. 
reflected. 
temp. 
Reading. 
Temp. abs. 
h. ni. 
O 
O 
0 
o 
lA 
10 3 
10 6 
72-4 
70-5 
1474 1 
1447 J 
> 
38-0 
62 5 
67'0 
7-6 
7176 
7044 
10 21 
10 23 
74-3 
73-8 
1513 ] 
1503 J 
39-6 
63-0 
58-8 
8-0 
7367 
7318 
10 40 
76-1 
1543 1 
7242 
10 43 
76-2 
1544 
41-3 
63'8 
60-0 
8'9 
7247 
10 44 
76-5 
1547 J 
7261 
iMean . 
7236 
IB 
10 29 
56-6 
1223 p 
5813 
10 .30 
10 32 
66-2 
56-6 
1214 
1223 
40-2 
63-5 
59-4 
8-5 
5770 1 
5813- 1 
10 33 
56-4 
1218 
5789 i 
10 51 
58-2 
1246 
5826 ! 
10 52 
58-6 
12.50 
42-1 
64-0 
60-5 
8-9 
5845 1 
10 53 
58-5 
1249 
f 
5841 1 
0 52 
0 54 
65-0 
64-2 
1361 1 
1346 J 
43-6 
64-5 
66-5 
13'2 
5771 j 
5708 
Mean . 
5797 
! 
Note.—N ew platinum strip put in after these observations were made. Balance readings here refer 
to Calibration-line 2. 
