138 
MR. GLAISHER ON THE RADIATION OF HEAT, 
Excess of the reading of a thermometer placed in air at the height of 4 feet, protected from thi 
of radiation, above the readings of thermometers placed on different substances fully expose 
Excess of the reading of the thermometer in air above that placed 
On long grass covered by 
33 
E* 
O 
rg 
o 
s 
£ 
1843. 
Day, hour and mini 
Reading of Therm, a 
height of 4 feet above tl 
protected from radia 
On long grass. 
On short grass. 
On raw wool on gras 
On flax on grass. 
In focus of reflector 
Nine inches above woe 
One inch below surfai 
of ground under shoi 
grass. 
On surface of gromv 
under short grass. 
On surface of groun 
under long grass. 
j White raw wool. 
a 
| White tin. 
White tin one inch 
1 high. 
Blackened tin. 
<$ 
o 
| Glass one inch high, j 
On garden mould. 
Six inches high abov 
grass. 
One foot high above gra 
Two feet high above gro 
Jet black. 
White. 
Green. 
XVII. 
Dec. 13. 
h 
17 
m 
15 
O 
41-5 
o 
0-5 
o 
0-5 
O 
1-5 
O 
1-5 
O 
0 
O 
° 
0 
° 
° 
o 
O 
o 
o 
0 
° 
o 
0 
o 
O 
0 
a 
Nov. 27. 
19 30 
48-3 
2-8 
2-7 
3-5 
2-2 
2-9 
0-3 
1-6 
2 1 
1-6 
-0-2 
-0-4 
£ 
29. 
21 
0 
35-0 
2-5 
3-8 
2-0 
1*5 
20 
— 0-5 
-5-0 
-2-0 
-0-2 
-05 
Dec. 13. 
17 
0 
41-5 
2-5 
2-5 
2-5 
2-5 
Nov. 20. 
5 
30 
43-2 
3-4 
3-7 
3*5 
-0-8 
—3*6 
3-2 
20. 
8 
0 
437 
3-9 
5-4 
5-7 
5-4 
5-2 
17 
-0-5 
3 7 
29. 
18 
0 
33-7 
39 
3-9 
5-7 
5-7 
3-9 
17 
-6-3 
-2-3 
0 5 
0-2 
5 
10 
37-0 
4-0 
4-0 
4-4 
4 0 
4-2 
1-8 
-3 0 
1-9 
1-0 
0*2 
I 
27. 
4 
10 
51-8 
4-8 
4-3 
5-8 
4-8 
0-8 
-2-8 
30 
00 
3-3 
0-4 
0*4 
77 
79 
73 
27. 
11 
30 
48-5 
47 
4-5 
5-9 
4-2 
47 
1-3 
10 
1-5 
3-5 
03 
0*6 
27. 
13 
30 
47'0 
4-0 
4-0 
5*5 
47 
0-6 
0-6 
1-0 
3-0 
-0-2 
-0-5 
X 
29. 
19 
0 
34-5 
4-7 
4-7 
67 
57 
40 
2-4 
-5-0 
-1-0 
1-4 
07 
X 
Dec. 6. 
11 
0 
41-2 
4-8 
5-2 
6-2 
5-2 
5-2 
1-4 
-0-8 
32 
-0-8 
22 
2-2 
2-2 
47 
-0-2 
00 
13. 
18 
0 
40-0 
4-5 
4-5 
4-5 
4*5 
3-0 
1-8 
-1-0 
1-8 
-0-5 
1-5 
i-5 
25 
2-5 
4-5 
50 
2-5 
-0-5 
-0-5 
15. 
3 
45 
48-7 
4-7 
4-7 
37 
4-6 
4*5 
0-6 
27 
3-4 
o*3 
3-4 
3-9 
1-5 
-07 
-0-3 
15. 
19 
30 
430 
4-0 
5 0 
4-0 
5-0 
50 
1-2 
1-2 
30 
-10 
3*0 
1-5 
0-8 
0-8 
Nov. 15. 
4 
15 
380 
5-9 
5-0 
6-5 
57 
70 
2-5 
-27 
0-7 
3-2 
0-8 
18. 
9 
30 
40-1 
51 
4-3 
5-3 
18. 
10 
0 
40-3 
5-3 
5-3 
4-3 
5-5 
5-3 
1-5 
-07 
21 
0-3 
07 
20. 
9 
30 
42-0 
5-5 
5-2 
6 0 
5-6 
1-0 
3-7 
-0-2 
23. 
11 
0 
37-8 
5-0 
50 
6-3 
6-8 
6 3 
1-3 
-3-2 
-0-2 
3-3 
0-2 
0-2 
4*7 
4-2 
4-3 
28. 
4 
10 
48-5 
5-9 
5 2 
6 0 
5-6 
5-4 
0-9 
1-3 
2-3 
30 
0-0 
-0-3 
19 
2-0 
2-4 
28. 
5 
0 
47-4 
5-2 
4-5 
5-4 
4-3 
47 
07 
07 
1-8 
2-8 
-0-4 
-0-6 
37 
3-3 
2-8 
X 
29. 
17 
0 
33’8 
5-8 
4-3 
6 6 
5-8 
3-8 
0-8 
- 7-2 
-2-2 
-0-4 
-0-9 
X 
Dec. 5. 
21 
0 
415 
5-3 
5 0 
5-5 
50 
47 
1-5 
-07 
1-5 
0-5 
3-8 
37 
2-7 
2-3 
03 
0 0 
6. 
3 
45 
46-2 
5-8 
6-2 
6-9 
61 
5*5 
1-2 
0-4 
30 
21 
3-2 3-5 
4-4 
3-2 
-07 
-0-5 
14. 
3 
0 
457 
5-9 
5-2 
5-2 
4-5 
67 
0-5 
17 
3-7 
2-9 
3-7 
37 
2-9 2-9 
4-9 !4-5 
2-5 
-0-1 
-0-3 
14. 
4 
0 
44-7 
5-7 
5-8 
5-8 
5-5 
57 
1-2 
17 
2-9 
2-5 
3-7 
3-7 
4-2 2-5 
47 
3-8 
17 
-0-3 
-0-3 
15. 
5 
0 
474) 
5-6 
5-3 
5-4 
5-9 
5-6 
1-4 
2-6 
41 
2-6 
4-2 
-0-2 
-0-4 
15. 
18 
0 
43-2 
5-4 
5-2 
4-6 
47 
4-4 
1-4 
1-2 
2-9 
1-2 
3-6 
-0-6 
-0-8 
15. 
21 
0 
45 0 
5-0 
4-5 
4-3 
5-8 
5-0 
1-8 
27 
30 
2-2 
2-3 
30 
-0-3 
00 
Nov. Id. 
13 
5 
31 0 
6-3 
6 0 
5-8 
62 
4-5 
2-8 
-4 0 
1-0 
10 
10 
18. 
5 
30 
41-6 
6 8 
5-S 
8 1 
78 
3-5 
47 
23. 
14 
0 
35-7 
(3 7 
6-7 
9-5 
9-5 
87 
-3-8 
— 11 
4-5 
1-2 
7-2 
23. 
15 
0 
35 0 
6 5 
6-8 
10 0 
9-8 
9-0 
2-7 
-4 0 
-2-0 
4-0 
1-2 
10 
24. 
4 
0 
40-7 
67 
6-2 
6-7 
67 
67 
30 
-2-3 
0-3 
4-2 
1-9 
1-7 
28. 
45 
491 
6V 
41 
5-6 
5 5 
5-6 
27 
17 
1-6 
07 
-0-1 
28. 
21 
0 
44-8 
6-6 
7-0 
7-8 
6-6 
6-3 
07 
1-8 
4-8 
17 
0-8 
Dec. 5. 
17 
30 
40-6 
6-6 
56 
61 
6-3 
61 
20 
-2-6 
-0 6 
47 
-0-1 
-0-3 
5. 
19 
30 
40-5 
6-7 
5-5 
6 5 
70 
6-5 
21 
-2-2 
0-9 
4-2 
0-0 
-0-3 
6. 
7 
10 
42-4 
6-9 
6-4 
6-4 
6-4 
5-4 
2-3 
-0-6 
1-6 
0-4 
3-8 
-06 
-1-0 
6. 
14 
0 
4 10 
6-0 
60 
5-7 
5-0 
60 
1-4 
-0-2 
20 
-0-5 
2-0 
4-8 
40 
-0-2 
-0-2 
11. 
6 
30 
39-0 
6-8 
60 
70 
7-2 
5-0 
1-8 
-2-5 
0-0 
-2-5 
40 
5-0 
3-5 
30 
5-5 
4-4 
30 
1-2 
20 
11. 
9 
30 
36-6 
6-4 
5-8 
61 
76 
61 
2-3 
-3-3 
-0-1 
-3-3 
37 
3-6 
2-6 
3-1 
41 
2-8 
1-3 
0-6 
0-4 
Dec 13 
17 
5 
1 41-5 
6-5 
5-5 
6 5 
6-5 
2-3 
14. 
5 
44-4 
6-2 
5-9 
5-2 
5-2 
5-4 
1-2 
1-9 
3-2 
2-2 
3-4 
3-4 
2-4 
2-4 
4-4 
4-6 
1-9 
-07 
-0-6 
On lambs’ wool 
Dec. 6, ll h 0 m . Dew is abundant, yet the temperature of the dew-point is from 4° to 5° below that of the air, being about the same as that of the n 
are thickly covered with dew (see Table XX.). 
Dec. 13, 12 h 0‘". The sky was overcast with a high and very black cirrostratus. The temperature of the air was 45° ; the readings of the thermoir.i 
