Pressure of the Wind. 
299 
Times which the Wind blew from the different Points of the Compass. — The wind blew most frequently from 
the SW., and least so from SE. by E. ; the number for the former, from 12 daily observations, being 403, and, 
for the latter, 1. If we take the sums of the times from 12 observations, for the five points SSW. to WSW., 
corresponding to SW., from WSW. to WNW., con-esponding to W., and so for the others of the 8 principal 
points, we find that the number of times which the wind blew was the maximum at SW., a secondary minimum 
at NW., a secondary maximum at NE., and the minimum at SE. The sums are as follow : — 
SW. W. NW. ST. NE. E. SE. S. 
963 344 208 250 476 166 55 281 
The wind blew twice as often from the points included between N., W., and S., as from the opposite semi- 
circle N., E., and S. 
Sums of the Pressures with which the Wind blew from the different Points of the Compass. — The greatest sum 
is that for SW., being, from 12 observations, 381 lb., and the least that for SE. by E., being 0*3 lb. Summing 
the pressures for each five points, including the 8 principal points as above, we have, for 12 observations, — 
SW. W. NW. N. NE. E. SE. S. 
lb. lb. lb. lb. lb. lb. lb. lb. 
834-5 328-3 252-9 204-6 236-5 114-3 40-8 238-7 
The sums of the pressures are, therefore, greatest about SW. ; they diminish round by W. and NW. to N., 
where there is a secondary minimum, a secondary maximum occurs about NE. ; the sums then diminish to SE., 
about which they are the minimum, increasing from thence to SW. 
Mean Pressure of the Wind while blowing from the different Points of the Compass. — The mean pressure of 
the wind was greatest while blowing from WNW., being 1*72 lb., and least while blowing from the opposite 
point ESE., being 0 - 20 lb. If the sums of the pressures about the 8 principal points be divided by the times 
which the wind blew about the same points, we obtain the following means : — 
SW. W. NW. N. NE. E. SE. S. 
lb. lb. lb. lb. lb. lb. lb. lb. 
0-87 0-95 1-22 0-82 0-50 0-69 0-74 0-85 
The mean pressure with which the wind blows is therefore greatest about NW., it becomes less at the 
N., and is least at NE., from which point it increases gradually by SE., S., SW., and W., to the maximum 
at NW. 
TABLE XXXII.— Sums of the Pressures of Wind in Table XXXI. resolved for each Hour into the 
Four Cardinal Points of the Compass, together with the Value and Direction of the Resultant. 
Resolved Sums in 
Resultant. 
Hour tidttingen 
Mean Time. 
N. 
E. 
S. 
W. 
Sums. 
Means. 
Directions. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
18 h 
33-3 
18-4 
61-6 
71-9 
60-5 
0-44 
W- 28 S. 
20 h 
34-8 
18-0 
49-5 
69-3 
53-4 
0-32 
W. 16 S. 
22 h 
44-3 
24-5 
63-6 
89-2 
67-5 
0-33 
W. 17 S. 
0 h 
60-2 
27-4 
760 
108-2 
82-3 
0-35 
W. 11 s. 
2 h 
55-1 
34-3 
88-2 
110-8 
83-4 
0-33 
W. 23 S. 
4 h 
54-0 
34-4 
67-9 
91-3 
58-6 
0-24 
W. 14 S. 
6 h 
42-0 
25-4 
60-9 
75-3 
53-4 
0-25 
W. 21 S. 
8 h 
31-9 
16-3 
47-6 
61-0 
47-4 
0-28 
W. 19 S. 
10 h 
23-6 
12-6 
47-4 
54-1 
47-8 
0-38 
W. 30 S. 
Sum of 9 Obs. 
378-7 
211-0 
562-2 
730-4 
550-9 
0-32 
W. 19 S. 
Sum of 12 Obs. 
469-2 
257-1 
737-5 
948-1 
741-3 
0-34 
W. 21 S. 
The mean resultants are obtained on dividing the sum resultants by the number of times which the wind blew. 
