PRESSURE AND DIRECTION OF THE WIND. 295 
TABLE XXX.—Sums of the Pressures of Wind in Table XXIX., resolved for each Month and 
Quarter into the Four Cardinal Points of the Compass, together with the Value and Direction of 
the Resultant. 
Resolved Sums in Resultant. 
Period. 
Means. Directions. 
1b. 2 
January : 1-23 Sle ASE 
February : 0-62 8 Ww. 
March : 5 0-07 31 E. 
April . 0-43 23 S. 
0-29 4N. 
0-16 4E. 
July . . 0-42 37S. 
August : : 0-38 26 W. 
September . 0-13 24 N. 
October 0-27 158. 
November . 0-61 24 S. 
December : . 0-93 40 S. 
sata anreunduues 
Mean Met. Qrs. 
Spring 
Summer 
Autumn 
Winter 
Astron. Qrs. 
Spring 
Summer 
Autumn 
Winter 
The Year 
The mean resultants are obtained from the sum resultants in dividing the latter by the numbers of times 
which the wind blew. 
Annual Variation of the Resultant Pressure of the Wind.—The resultant sums and means of pressures are 
the maximum in January and the minimum in March, a secondary minimum occurs in June, secondary maxima 
occurring in the months before and after it, and a minimum occurs in September, differing little in value from 
that for March; the resultant increases from thence till December. The quarterly periods for the astronomical 
group seem most regular. The resultant is nearly zero for the astronomical summer, it has about equal values 
in Spring and Autumn, and it is greatest in Winter. 
The direction of the Resultant is between S. and W. seven months of the year, namely, in January, April, 
July, August, October, November, and December; it is between N. and W. two months, namely, in February 
and September ; it is between N. and E. two months, namely, in May and June; and it is between S. and E. 
one month, namely, March. 
The direction of the resultant wind for 1843 is W. 18° S. 
