128 
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 th 
of radiation, above the readings of thermometers placed on different substances fully exposec 
Excess of the reading of the thermometer in air above that placed 
Number of the Table 
1843. 
Astronomical day, 
hour and minute. 
Reading of Therm, a 
the height of 4 feet 
above the soil, protect 
from radiation. 
1 
On long grass. 
On short grass. 
On raw wool 
on grass. 
On flax on grass. 
In focus of reflector. 
Nine inches above 
wood. 
One inch below 
surface of ground 
under short grass. 
On surface of 
ground under 
short grass. 
On surface of 
ground under 
long grass. 
'O 
3 
o 
S 
g 
3 
ci 
t£) 
a 
O 
On gravel. 
On river sand. 
On river sand on the 
raised board. 
One inch high above 
grass. 
Two inches high 
above grass. 
Three inches high 
above grass. 
Six inches high 
above grass. 
Twelve inches high 
above grass. 
On un wrought 
white cotton wool 
on grass. 
On unwrought 
white cotton wool 
h m 
0 
o 
O 
O 
o 
o 
o 
o 
o 
o 
Sept. 13. 19 20 
54-8 
- 2-2 
-2 2 
... 
00 
- 2-2 
- 2-2 
- 2-2 
0-8 
- 2-2 
- 2 - 
17. 19 20 
61-5 
-07 
-0 2 
-10 
-io 
0-0 
-0-5 
-1-3 
- 1-2 
i-7 
22 . 18 0 
52 2 
-11 
- 0-8 
00 
, . , 
-1-4 
0-4 
0-4 
... 
-2-3 
22. 19 20 
54-2 
-23 
-11 
- 0-8 
- 1-8 
0-2 
0-9 
-3-8 
24. 18 40 
49-0 
02 
0-9 
2-0 
10 
00 
1-0 
17 
- 0-8 
25. 19 20 
44-5 
0-8 
1-3 
05 
... 
... 
-17 
0-5 
13 
-27 
Oct. 15. 19 20 
320 
0-4 
17 
2-4 
22 
-01 
i-3 
... 
... 
1-7 
i -2 
2-2 
Sept. 24. 18 15 
48-7 
1-3 
16 
2-6 
1-6 
.. 
- 0-1 
17 
1-8 
0-4 
2 
26. 17 35 
40-8 
17 
1-4 
2-4 
0-3 
1-2 
1-6 
1-0 
Oct. 16. 14 50 
400 
1-0 
10 
i-b 
io 
2-0 
0-5 
... 
... 
1-0 
1-0 
1-0 
Sept. 18. 17 30 
60-3 
25 
21 
... 
1-3 
2-5 
2-3 
2-3 
1-7 
20 
Oct. 3. 11 35 
58-3 
2-6 
2-3 
i 7 
0-4 
1-8 
... 
... 
1-6 
07 
2-5 
4. 11 20 
557 
27 
27 
1-9 
17 
... 
... 
2-7 
27 
2-7 
2-5 
12. 18 25 
38-5 
25 
2-5 
2-0 
2-5 
2-5 
2-5 
2-5 
2-0 
2-5 
Sept. 20. 18 20 
50 7 
3-7 
30 
2-5 
1-5 
. . . 
1-9 
2-1 
4-7 
21. 13 20 
57-2 
3-2 
30 
2-9 
07 
... 
... 
2-6 
21 
0-6 
... 
22. 15 30 
50-5 
3-3 
2-9 
1-3 
... 
2-9 
ii 
2-3 
3-3 
1-2 
Oct. 12. 17 15 
380 
32 
3-2 
5-0 
50 
30 
20 
... 
... 
... 
30 
20 
5 0 
13. 15 20 
41-5 
3-5 
30 
30 
2 2 
27 
0-9 
... 
1-9 
1-2 
30 
> 
IS. 21 0 
38-2 
30 
30 
5-5 
4-0 
4-5 
27 
2-8 
0-8 
30 
1-0 
0-8 
3-£ 
27. 5 0 
440 
3-3 
1-8 
22 
2-9 
20 
ib 
-30 
-i-5 
0-8 
-0-7 
0-4 
20 
10 
0-9 
2-7 
Nov. 3. 7 40 
48-1 
31 
3-8 
67 
6 1 
3-9 
11 
-0-5 
-21 
1-9 
21 
3-3 
3 1 
0-5 
-01 
5-0 
4. 7 0 
42-5 
3-8 
20 
7-0 
6-3 
27 
1-5 
-5-5 
-10 
-0-5 
-25 
- 0-6 
1-5 
... 
0-7 
0-2 
30 
9. 6 30 
32-5 
3-5 
27 
20 
20 
2-5 
0-9 
-60 
-2-3 
... 
0-5 
07 
0-5 
-0-3 
- 0-2 
3-5 
Sept. 13. 15 37 
49-5 
4-5 
4'5 
6-5 
... 
... 
0-5 
4-5 
4-0 
4-5 
30 
4-5 
4-5 
21. 9 10 
607 
47 
47 
3-9 
... 
4-3 
4-3 
2-4 
4-5 
Oct. 3. 15 20 
556 
4 9 
4 0 
3-6 
2-4 
3-2 
3-3 
2-4 
7-3 
5. 11 0 
54-5 
4-5 
41 
3-5 
2-0 
3-3 
3-3 
2-5 
13. 11 0 
415 
4-8 
4-5 
47 
3-5 
4-3 
20 
... 
3-5 
1-5 
4-5 
• 
13. 20 40 
40-5 
4-5 
3-5 
8-5 
4-5 
2-5 
2-5 
1-5 
8-5 
> 
20 . 11 20 
42-3 
4-8 
3-8 
5-8 
5-5 
3-8 
0-8 
-07 
0-3 
1-5 
i -8 
i-5 
2-3 
0-1 
0-1 
5-1 
20. 13 0 
44-8 
4-0 
1-8 
3-6 
4 0 
1-8 
00 
-1-3 
1-3 
0-8 
10 
0-8 
1-6 
- 0-2 
- 0-2 
2-6 
23. 7 SO 1 
49-2 
4-3 
30 
5 2 
50 
36 
07 
00 
0-5 
1-2 
11 
2-0 
2-4 
0-0 
- 0-6 
4-2 
Nov. 3. 10 30 
521 
4-1 
2-3 
4-6 
61 
3-6 
0-6 
-3-3 
4 0 
2-9 
3-6 
3-3 
3-9 
... 
0-6 
0 1 
4-6 
7. 9 0 
431 
41 
5-9 
91 
7-9 
5-3 
2-3 
-30 
1-9 
2-3 
21 
1-6 
3-5 
0-3 
0-1 
61 
15. 5 10! 
37 0 
4-0 
4-0 
4.4 
4-0 
42 
1-8 
—3-0 
... 
1-0 
02 
4-0 
Sept. 13. 15 24; 
500 
5-5 
60 
80 
10 
60 
5-0 
6-0 
3-5 
6-0 
5 5 
13. 17 20 
51-5 
5-5 
55 
10 
5-5 
4-5 
5-5 
3-5 
5-5 
5-5 
17. 17 20; 
58-0 
5-2 
30 
2-8 
1-2 
2-9 
2-6 
2-3 
i-s 
20 . 16 20 
510 
50 
38 
30 
... 
3-8 
40 
2-0 
67 
20 . 17 20, 
500 
5-8 
38 
22 
30 
30 
2-6 
6-9 
Oct. 2. 9 20 
57-2 
5-9 
4-7 
3-6 
12 
3-6 
3-4 
i -8 
5 2 
v> 
3. 11 10 
583 
5-8 
57 
3-5 
23 
27 
2-8 
1-9 
6-3 
5. 9 30 
53-5 
5-2 
4-5 
3 5 
2-0 
3-2 
3-5 
2-5 
9. 18 0 
39-2 
5'2 
3-8 
2-7 
2-4 
- 0-8 
27 
2 2 
2-2 
. ■» 
12. 15 15' 
357 
57 
5-9 
100 
70 
5-9 
3-2 
3-9 
3-2 
8-2 
16. 13 0 
36-5 
5 5 
3 5 
4-5 
45 
5-5 
10 
3-5 
25 
... 
4-5 
23. 5 15 
50-5 
5-3 
47 
14-4 
90 
5 5 
20 
-0-4 
i-o 
2-3 
20 
3-5 
3-3 
1-0 
0-3 
12-7 j 
Oct. 16, 14 h 50 m ; rain falling. Sept. 18, 17’ 1 30 m ; after a heavy rain. Sept. 20, 18 11 20 m ; after the sun had risen, clouds thin in zenith, Oct. 12 
rain. Oct. 18, 21 h 0 m ; sun high. Oct. 3, 15 h 20 m ; the stars are shining dimly. Oct. 5, ll h 0 m ; a few stars have been visible occasionally east of zei 
13, 20 h 40 m ; the sun had risen more than two hours. Nov 3, 10 h 30 m ; nocturnal rising temperature of the air, and the reading of the barometer is 
Sept. 17, 17 h 20 m ; deposition of moisture. Oct. 9, 18 h 0 m ; clouds in every direction. Oct. 12, 15 h 15"'; some rain had fallen. 
Oct. 18, 21 h 0 m . The observations at this time have not been used in subsequent calculations, they were taken after a long series of observations, 
over the whole night. On examining the state of the different substances at this time, it was found that every fibre of cotton wool was encrusted with 
fringe of hoar-frost, and there were a few spikes of ice : raw wool was covered with lumps of ice, and there were some clear transparent flakes of ice, ; 
