Pkessure and Dieection of the Wind. 
XCIX 
These numbers still present several irregularities ; on the whole, however, the wind blows with the greatest 
force about 1^^ p.m., and Avith the least force about 7^^ p.m., or about an hour after noon and an hour after sunset 
respectively ; another minimum of force occurs at 7^ a.m., an hour after sunrise, and a secondai-y maximum 
occurs between 11** p.m. and 5'* a.m., the exact epoch is not deducible from these means ; the means for 1844 
and 1845 only, place it near midnight. 
207. Yearly Mean Value and Direction of the Resultant Wind. — From the last line of Table 95, it appears 
that the direction of the resultant wind was nearly constant in each of the three years, 1843, 1844, and 1845. — 
1846 appears to have been quite anomalous ; in each of the former years there are eight or nine months in 
which the resultant wind blows from between west and south, for only two or three of these months is the 
resultant nearer south than west ; but in 1846 there are ten months, for which the resultant wind blows from 
between south and west, and for eight of these it is nearer south than west. 
If we neglect the year 1846, the winds atMakerstoun are equivalent to one continuous wind blowing from 
nearly WSW. with a force approximately of about two-tenths of a pound on a square foot of surface. 
Table 95. — Values and Directions of the Resultant Winds, with the Sums of the Pressures of the 
Wind resolved into the four Cardinal Points of the Compass, for each Month of the Years 1843-6. 
1843. 
184:4. 
1845. 
184G. 
1 
1843-6. 
1843-6. 
Sums of Pressure 
3 ob- 
served at the 24 Obser- 
.Month. 
Resultant. 
Resultant. 
Resultant. 
Resultant. 
vation Hours for 100 
Resultant. 
Days in each jMonth, 
resolved into 
Mean. 
Direction. 
Mean. 
Direction. 
Mean. 
Direction. 
Mean. 
Direction. 
N. 
E. 
S. 
w. 
Mean. 
Direction. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
Jan. 
0-93 
W. 17 S. 
0-27 
W. 8 S. 
0-36 
S. 29 W. 
0-37 
S. 
43 W. 
172 
45 
700 
933 
0-43 
W. 29-5 S. 
Feb. 
0-43 
N. 8 W. 
0-14 
W. 37 N. 
0-22 
W. 9 S. 
0-38 
w. 
34 S. 
534 
161 
408 
565 
0-18 
W. 17-3 N. 
Mar. 
0-04 
S. 31 E. 
0-20 
W. 5 N. 
0-39 
W. 2 S. 
0-52 
s. 
38 W. 
332 
153 
580 
667 
0-24 
W. 26.3 S. 
April 
0-26 
W. 23 S. 
0-35 
W. 32 S. 
0-15 
N. 7 E. 
0-21 
N. 
24 E. 
423 
174 
406 
423 
0-10 
W. 3-9 N. 
May 
0-20 
E. 4 N. 
0-16 
N. 24 E. 
0-28 
N. HE. 
0-32 
s. 
44 W. 
446 
377 
313 
317 
0-06 
N. 24-2 E. 
June 
0-12 
N. 4 E. 
0-34 
W. 30 S. 
0-34 
S. 44 W. 
0-30 
s. 
39 W. 
223 
133 
540 
549 
0-22 
W. 37-4 S. 
July 
029 
W. 37 S. 
0-06 
W. 4 N. 
0-13 
W. 43 S. 
0-38 
s. 
44 W. 
140 
88 
445 
451 
0-20 
W. 40-0 S. 
Aug. 
0-18 
S. 26 W. 
0-18 
W. 15 S. 
0-16 
W. 29 N. 
0-07 
s. 
30 W. 
186 
79 
292 
332 
0-1 1 
W. 22-7 S. 
Sept. 
006 
W. 24 N. 
0-07 
W. 33 S. 
0-15 
W. 29 S. 
0-05 
s. 
34 W. 
161 
111 
238 
267 
0-07 
Vf. 26-1 S. 
Oct. 
0-19 
W. 1 s. 
0-23 
S. 43 W. 
0-45 
W. 34 S. 
0-08 
w. 
35 S. 
249 
156 
543 
613 
0-23 
W. 32-8 S. 
Nov. 
0-33 
W. 24 S. 
0-14 
S. 23 E. 
0-44 
S. 32 W. 
0-28 
s. 
15 W. 
176 
192 
705 
505 
0-26 
S. 30-7 W. 
Dec. 
0-69 
W. 40 S. 
0-06 
E. 30 S. 
0-69 
W. 16 S. 
0-24 
N, 
40 W. 
262 
42 
546 
790 ! 
0-33 
W. 20-8 S. 
Year 
020 
W. 21 S. 
0-13 
W. 21 S. 
0-23 
W. 23 S. 
0-19 
w. 
41 S. 
274 
143 
477 
535 
0-18 
W. 27-3 S. j 
208. Annual Variation of the Force and Direction of the Bcsultant M'inds. — The details of these discus- 
sions will be found in pages 64 and 84 of this volume, p. 295, 1843, and p. 434, 1844. From Table 95, it 
I appears that — 
! 1st, The sums of pressures of the northerly winds are greatest in the montlis of February, March, April, 
I and May ; they are least in the months of July, August, September, and November. 
2c?, The sums of pressures of the easterly winds are t"v\dce a maximum and twice a minimum in the year ; 
they are a principal maximum in May, and a secondary maximum in November ; they are a minimum in July 
and August, and in December and January, 
3(i, The sums of pressures of the southerly winds are greatest in November and January, and they are 
least in September. 
4</(, The sums of pressures of the westerly winds are greatest in December and January, and they are least 
] in September. 
bth, When we examine the approximate mean forces of the resultant wind for each month, we find that on 
the whole they exhibit two maxima and two minima in the course of the year. The resultant wind is a principal 
' maximum in January, and a secondary maximum in June and July ; it is a minimum in May and in September. 
! Qth, The direction of the resultant wind is from 17° north of west in February, from 4° north of west in 
j April, from 24° east of north in May, and from between west and south in the remaining nine months of the year. 
MAG. AND MET. OBS. 1845 AND 1846. 2 h 
