97 
Table II. 
rd 
1 
A 
o 
4 
l 
A 
<M 
eg 
I 
rd 
4 
l 
4 
rd 
o 
r— 1 
1 
x> 
rd 
<M 
rH 
1 
A 
o 
rH 
rd 
rH 
1 
rH 
rS 
CD 
rH 
1 
rH 
rH 
00 
rH 
1 
eg 
rH 
A 
1 
A 
oo 
rH 
rd 
<N 
1 
rd 
o 
CO 
rd 
o 
1. 
4 
<m 
1859 
11*4 
10-4 
9-4 
8-4 
9-1 
8-5 
8-2 
7-5 
7-8 
7-4 
7-5 
9-0 
1860 
18-3 
18-6 
17-6 
17-7 
15-9 
17*1 
15-8 
14-9 
14-8 
15-1 
176 
19*2 
16-8 
1861 
161 
17-3 
14-9 
11-2 
11-7 
91 
11-4 
11*0 
11-9 
12-3 
12-8 
16-6 
13-0 
1862 
187 
17-2 
16-5 
14*1 
13-9 
14-2 
14*1 
14-2 
14-2 
14-1 
16-2 
17-7 
15-4 
1863 
21-2 
20-2 
18-5 
16-8 
175 
16-9 
17-6 
170 
163 
16-3 
18-5 
20-9 
18-1 
1864 
139 
14-3 
12-9 
10-8 
11-0 
11*7 
11-2 
10-5 
9-5 
96 
11-3 
12-6 
11-6 
1865 
14*1 
13-7 
11-4 
10-6 
10-7 
11-0 
10'5 
9*9 
100 
10-8 
12-9 
139 
11-6 
Resolving the directions in each of the columns of Table I 
into their rectangular co-ordinates A and B, in the direction 
of the meridian and at right angles to it, by using the corre- 
sponding velocities in Table II., and taking the means of 
the values of A and B, we obtain the mean direction 6 for 
the hour indicated at the head of the column, from the 
equation 
Tan 0 
A 
and the corresponding mean velocity v from the equation 
A 
COS0 
The mean directions and velocities thus obtained are 
shown in Table III. 
Table III. 
h. 
Mean 
Direction. 
... 227 41 ... 
Mean 
Bi-horary 
Velocity. 
h. 
Mean 
Direction. 
... 221 43 ... 
Mean 
Bi-horary 
Velocity. 
0 ... 
... 15*58 
12 ... 
... 11-84 
2 ... 
... 229 46 ... 
... 15-35 
• 14 ... 
... 222 29 ... 
... 11-58 
4 ... 
... 227 52 ... 
... 13-83 
16 ... 
... 221 57 ... 
... 11-55 
6 ... 
... 226 0 ... 
... 12-08 
18 ... 
... 224 10 ... 
... 11-64 
8 ... 
... 221 33 ... 
... 12-02 
20 ... 
... 224 5 ... 
... 13-32 
10 ... 
... 220 27 ... 
... 11-74 
22 ... 
... 227 43 ... 
... 14-78 
In Table XII. of the results of the “ Radcliffe Observa- 
tions” the mean directions are given for the hours Oh., 2h., 
4h., &c.; but in Table XIII. the velocities are given for the 
bi-horary intervals Oh. — 2h., 2h. — 4h., 4h. — 6h., &c., or for 
