186 
MR. GLAISHER ON THE RADIATION OF HEAT, 
Table XCII. 
General state of the 
sky during the night 
previous to reading 
the instruments. 
1844. 
June. 
Day and 
hour of 
reading. 
Reading of 
thermo- 
meter in 
air at the 
height of 
4 feet. 
Excess of the reading of a thermometer in air, at the height of 4 feet 
and protected from the effects of radiation, above that placed 
On long 
grass. 
On short 
grass. 
On flax. 
On white raw 
wool. 
In focus of 
metallic reflector. 
d h 
o 
o 
O 
o _ 
O 
Cloudless. 
10 21 
48-1 
10-8 
10-1 
9-5 
9-6 
5-1 
13 21 
53-0 
8-6 
8-8 
7-0 
9-0 
7-0 
16 21 
47*1 
10-9 
9-4 
5-7 
5*6 
2-5 
22 21 
54-0 
11 -2 
10 1 
10-0 
23 21 
63-1 
12*2 
7-1 
9-1 
9-1 
66 
30 21 
52-5 
11*4 
10-4 
9-2 
Principally 
1 21 
44-1 
8*1 
8-1 
10-1 
9*3 
7-9 
cloudless. 
4 21 
48-6 
9-6 
11-6 
12-9 
13-6 
9-1 
8 21 
52-8 
10-5 
11-2 
12-3 
8-3 
14 21 
49-2 
7-9 
7-0 
7-2 
7-9 
6-0 
21 21 
57*3 
8-1 
7-2 
9-5 
10-4 
7-4 
Half-cloudy. 
3 21 
48-8 
10-8 
10-8 
7-9 
7 21 
52’4 
8-4 
7*6 
8-9 
4-6 
9 21 
51*3 
6-5 
6-1 
6*5 
4*8 
11 21 
49-5 
6-0 
5-5 
3-5 
17 21 
53-9 
10-7 
11-5 
6-9 
8-8 
4-1 
20 21 
52-9 
3-7 
4-6 
4-2 
6-9 
3-4 
29 21 
58-9 
7-9 
7-1 
6-9 
Principally 
2 21 
44-5 
12-5 
12-0 
9-3 
cloudy. 
5 21 
54-2 
6-6 
6-2 
8*4 
6-4 
5-0 
6 21 
54-6 
4*6 
5-4 
5-7 
6-6 
3-0 
12 21 
52-7 
7-4 
6-3 
7-2 
8-9 
0-2 
15 21 
46-9 
12-3 
11-5 
9-5 
18 21 
52-5 
9-7 
8-2 
10-3 
11-2 
7-3 
19 21 
47-9 
5-9 
5-9 
7-9 
7-9 
5-1 
24 21 
58-9 
6-8 
6-0 
7-9 
7-9 
1-9 
27 21 
51-7 
12-7 
8-9 
12-5 
12-7 
10-6 
28 21 
49-9 
8-1 
8-2 
12-1 
11-6 
8-1 
Cloudy. 
25 21 
47*7 
1-4 
1-6 
2*4 
1-7 
3-5 
26 21 
52-9 
1-9 
1-6 
2-6 
1-9 
3-9 
