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. 



Period. 



Resolved Sums in 



Resultant. 



















N. 



E. 



S. 



W. 



Sums. 



Means. 



Directions. 





lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



o 



January 



49-8 



7-7 



113-3 



216-7 



218-4 



1-23 



W. 17 S. 



February 



120-2 



42-4 



29-1 



55-7 



92-1 



0-62 



N. 8 W. 



March 



26-6 



30-1 



33-8 



25-8 



8-4 



0-07 



S. 31 E. 



April 



27-8 



9-7 



50-9 



63-4 



58-5 



0-43 



W. 23 S. 



May 



34-5 



63-4 



30-8 



15-7 



48-9 



0-29 



E. 4N. 



June 



50-7 



32-8 



21-6 



30-9 



29-2 



0-16 



N. 4E. 



July 



9-4 



4-5 



50-2 



58-6 



67-8 



0-42 



W. 37 S. 



August 



1-6 



2-9 



40-0 



22-0 



42-9 



0-38 



S. 26 W. 



September 



20-4 



4-6 



14-5 



17-7 



14-4 



0-13 



W. 24 N. 



October 



29-7 



11-9 



30-6 



55-2 



43-3 



0-27 



W. 1 s. 



November 



21-9 



0-9 



53-5 



71-6 



76-5 



0-61 



W. 24 S. 



December 



0-9 



0-0 



105-0 



122-9 



161-1 



0-93 



W. 40 S. 



Mean Met. Qrs. 

















Spring 



88-9 



103-2 



115-5 



104-9 



26-7 



0-06 



S. 4 W. 



Summer 



61-7 



40-2 



111-8 



111-5 



87-1 



0-19 



W. 35 S. 



Autumn 



72-0 



17-4 



98-6 



144-5 



129,-9 



0-33 



W. 12 S. 



Winter 



170-9 



50-1 



247-4 



395-3 



353-6 



0-71 



W. 13 S. 



Astron. Qrs. 

















Spring 



174-6 



82-2 



113-8 



144-9 



87-3 



0-21 



W. 44 N. 



Summer 



94-6 



100^7 



102-6 



105-2 



9-2 



0-02 



S. 29 W. 



Autumn 



51-7 



19-4 



85-1 



94-9 



82-6 



0-21 



W- 24 S. 



Winter 



72-6 



8-6 



271-8 



411-2 



449-2 



0-94 



W. 26 S. 



The Year 



393-5 



210-9 



573-3 



756-2 



574-2 



0-32 



W. 18 S. 



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 Autiunn, 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. 



