PRESSURE AND DIRECTION OF THE WIND. xcix 
These numbers still present several irregularities ; on the whole, however, the wind blows with the greatest 
force about 14 p.m., and with 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 secondary 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 at Makerstoun 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. 
1843-6. 
Sums of Pressures ob- 
* served at the 24 Obser- 
Resultant. Resultant. Resultant. Resultant. vation Hours for 100 Resultant. 
Days in each Month, 
resolved into 
Direction. | Mean.| Direction. | Mean.| Direction. Direction. || N. : b 5 .| Direction, 
° 
lb. 
|| 172 
° 
° 
bo 
Ib. 
0-36 
0-22 
0.39 
0-15 
0-28 
0-34 
0-13 
0-16 
0-15 
0-45 
0-44 
Ib. 
0:27 
0-14 
0-20 
0:35 
0-16 
0.34 
0-06 
| 0-18 
0-07 
0.23 
0-14 
0-06 
toe bo 
443 
ow 
SU PWSIKWAWS « 
. || 423 
|| 446 
bo oo 
wo bo 
| 140 
| 186 
-| 161 
=» || 249 
|| 176 
ATK PR wre On~7 
bo 0 
mpnonwek ee 
OoOwFreATh OO 
(0A a be bl Tn OO 
bo 
ro 
PP PANAAM MAME sp 
Z2RRDnnAangn 
wseaezs 
4444424435 
CWWwWNKhOBr arto 
YP PsN NAnw Ma yn 
avaaasresase 
oke 
wr wre 
An 
vo 
bd mn 
W. 
N. 
8. 
W. 
E. 
N. 
W. 
8. 
Ww. 
W. 
Ww. 
W. 
WwW 
4 
= 
0-13 
. 
to 
—_ 
208. Annual Variation of the Force and Direction of the Resultant Winds.—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 
appears that— 
1st, The sums of pressures of the northerly winds are greatest in the months of February, March, April, 
and May; they are least in the months of July, August, September, and November. 
2d, The sums of pressures of the easterly winds are twice 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. 
8d, The sums of pressures of the southerly winds are greatest in November and January, and they are 
least in September. 5 
4th, The sums of pressures of the westerly winds are greatest in December and January, and they are least 
in September. 
5th, 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. 
6th, The direction of the resultant wind is from 17° north of west in February, from 4° north of west in 
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 anv 1846. 2b 
