248 PROFESSOR FORBES ON THE EXTINCTION OF THE SOLAR RAYS 
Table B. — Meteorological Observations at the Faulhorn, September 25, 1832. 
Mean 
time. 
Appa- 
rent 
time. 
Barometer, 
French lines 
at 0° Cent. 
Barometer, 
millimetres 
at 0° Cent. 
Detached. 
Therm. 
Reaum. 
Moist 
Therm. 
Reaum. 
Detached 
Therm. 
Fahr. 
Moist 
Therm. 
Fahr. 
Diff. 
Elasticity 
of vapour. 
Relative 
dampness. 
h m 
7 26 
h m 
7 34 
247-13 
557-49 
O 
3-2 
O 
-3-1 
39*2 
O 
25-1 
14-1 
inch. 
•038 
w = ’*48 
8 
7 
8 15 
247-15 
557-53 
3-8 
-2-2 
40-6 
27-1 
13-5 
•053 
9 15 
9 23 
247-24 
557-73 
3-8 
— 1-8 
40-6 
28-0 
12-6 
•067 
’° 6 ' — .qaq 
•270 
10 
9 
10 17 
247-34 
557-96 
4-1 
-1-9 
41-2 
27-7 
13-5 
•057 
S = * 2 06 
11 
7 
11 15 
247-33 
557-94 
4-2 
-1-6 
41-4 
28-4 
13-0 
•065 
Ws = “234 
0 21 
0 29 
247-28 
557-82 
4-6 
-0-8 
42-3 
30-2 
12-1 
•086 
— 6 — "301 
•286 
1 
4 
1 12 
247-18 
557-60 
5-5 
0-0 
44-4 
32-0 
12-4 
•096 
*°9 6 — . q 1 Q 
*308 1 ~ 
2 27 
2 35 
247-15 
557-53 
6-4 
+ 2-6 
46-4 
37-8 
8-6 
•172 
H = - 521 
3 30 
3 38 
246-99 
557-17 
5‘6 
+ 1-8 
44-6 
36-1 
8-5 
•l60 
4 16 
4 24 
246-90 
556-99 
4-5 
+ 1-5 
42-1 
35-4 
6-7 
•169 
61. The following Tables contain the observations with the actinometers at each 
station; those at the lower, made with the instrument G. 7, are made comparable to 
those at the upper with the actinometer B. 2, by the application of the constant fac- 
tor T168 already found. It has been already stated that the day was cloudless ; that 
the observations were made entirely in the open air at the Faulhorn : those at Brientz 
were made in a room until one o’clock, and afterwards in the open air. For the sake 
of brevity, the results only are given, and not the readings upon which they are 
founded. 
Table C. — Actinometer Observations at Brientz, September 25, 1832. 
Hour. 
Apparent 
time. 
Intervals 
observed. 
_ 
Actinometer G. 
7. 
Mean. 
Reduced to 
Remarks. 
r 
From 
To 
Mean. 
60 sec. 
B. 2. 
h 
m 
h 
m 
h 
111 
h 
HI 
s 
8 
2 
8 
n! 
8 
6 i 
8 
14J 
60 
18-7; 
19-0; 
19-7; 
20-7 ; 
19-5 
19-5 
22-8 
9 
5 
9 
IB 
9 
9| 
9 
171 
60 
22-9 ; 
22-2 ; 
22-9; 
22-8; 
22-7 
22-7 
26-5 
10 
5 
10 
15 
10 
10 
10 
18 
60 
23-3; 
23-5; 
24-4 ; 
24-3 ; 
23-9 
23-9 
27-9 
11 
3 
1 1 
15 
11 
9 
11 
17 
60 
24-2; 
24-6; 
25-2; 
25-3 ; 
25-2; 
24-9 
24-9 
29-1 
T : 
11 
50 
12 
5! 
11 
57| 
12 
5f 
60 
26-0 ; 
26-8; 
26-7; 
25-8; 
26-1 ; 
26-8 ; 
26-4 
26-4 
30-8 
>in a room. 
12 
5§ 
12 
19 
12 
1 21 
12 
20! 
60 
26-3; 
25-1 
26-7 ; 
27-1 ; 
27-4; 
26-8 ; 
26-9 
26-9 
31-4 
12 
19 
12 
24! 
12 
21f 
12 
29|- 
30 
25-4; 
25-2 
25-0; 
23-3; 
24-7 
27-5 
32-1 
1 
1 
1 
12! 
1 
6| 
1 
14f 
60 
26-2;? 
26-6; 
26-4; 
27-7; 
27-3 ; 
26-8 
26-8 
31-3 
J 
2 
17| 
2 
28! 
2 
23 
2 
31 
60 
21-7; 
21-3, 
21-3; 
21-0; 
21-3 
21-3 
24-9 
3 
2 
3 
11 
3 
6! 
3 
14- 
60 
20-8; 
20-7; 
20-5 ; 
20-9; 
20-7 
20-7 
24-2 
S-Ont.of Honrs. 
4 
4l 
4 
15! 
4 
10 
4 
18 
60 
15-8 ; 
15-1 
15-4 ; 
15-3; 
15-4 
15-4 
18-0 
r 
4 
38! 
4 
42i 
4 
40i 
4 
48 ! 
60 
11-1 ; 
9-9 
10-5 
10-5 
12-3 
J 
