434 



Results of Makerstoun Observations, 1844. 



Annual Variation of the Mean Pressure of Wind when blowing. — The annual variation of the mean 

 pressure of wind, obtained by dividing the sums of pressures observed, by the whole number of observations, has 

 been already considered. If, however, we divide the sums of pressures observed by the number of observations 

 for which a pressure of 0-1 lb. or more was observed, we obtain the means of pressures for the time which the 

 wind blew. The sums of pressure for each month from Table XXXIII. are as follow : — 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



223-4 



225-0 



323-9 



255-2 



127-4 



301-9 



100-7 



241-6 



201-9 



367-2 



396-3 



575 



Dividing these quantities by the number of times which the wind blew in the respective months we have 

 lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. lb. 



0-96 0-73 0-85 0-69 0-46 0-75 0-33 0-56 0-46 0-80 0-86 0-33 



These means shew generally that the pressure of the wind was least about the warmest quarter and greatest 

 about tbe coldest quarter of 1844. The mean for December is an exception to the generality of the result 

 for 1844. 



The mean pressure with which the wind blew in 1844 = 0-665 lb. 



TABLE XXXIV.— Sums of the Pressures of the Wind in Table XXXIII., resolved into the Four 

 Cardinal Points of the Compass, together with the Value and Direction of the Resultant, for each 

 Month, for each of the Meteorological and Astronomical Quarters, and for the Year 1844. 



Period 

 1844. 



Sums of Pressures resolved into 



Resultant 













Means with reference to 







N. 



E. 



S. 



W. 



Sums. 



Whole 

 No. of Obs. 



No. of Obs. 



Wind 



blowing. 



Directions. 



January 



lb. 



37-4 



lb. 



1-4 



lb. 



62-2 



lb. 



174-4 



lb. 

 174-8 



lb. 



0-27 



lb. 



0-75 



W. 8 S. 



February 



103-1 



34-7 



52-7 



102-4 



84-4 



0-14 



0-27 



W. 37 N. 



March 



109-2 



47-7 



98-6 



169-8 



122-6 



0-20 



0-32 



W. 5 N. 



April 



20-1 



2-3 



133-9 



185-7 



215-8 



0-35 



0-58 



W. 32 S. 



May 



103-0 



47-8 



5-7 



5-3 



106-2 



0-16 



0-39 



N. 24 E. 



June 



39-9 



18-1 



142-4 



193-0 



202-7 



0-34 



0-51 



W. 30 S. 



July 



33-0 



160 



30-4 



53-2 



37-3 



006 



0-12 



W. 4 N. 



August 



52-2 



30-3 



82-3 



143-3 



116-9 



0-18 



0-27 



W. 15 S. 



September 



51-2 



56-7 



72-9 



90-2 



39-9 



007 



0-09 



W. 33 S. 



October 



64-1 



70-8 



173-3 



171-0 



148-2 



0-23 



0-32 



S. 43 W. 



November 



75-0 



159-8 



153-1 



126-9 



84-7 



0-14 



0-18 



S. 23 E. 



December 



6-2 



35-7 



25-8 



1-7 



39-3 



006 



0-22 



E. 30 S. 



Mean Met. Qrs. 



















Spring 



232-3 



97-8 



238-2 



360-8 



263-1 



0-14 



0-26 



W. 1 S. 



Summer 



1251 



64-4 



2551 



389-5 



3501 



0-18 



0-31 



W. 22 S. 



Autumn 



190-3 



287-3 



399-3 



388-1 



2320 



0-12 



017 



S. 26 W. 



Winter 



146-7 



71-8 



140-7 



278-5 



206-8 



0-11 



0-29 



W. 2 N. 



Astron. Qrs. 



















Spring 



232-4 



84-7 



285-2 



457-9 



376-9 



0-20 



0-35 



W. 8 8. 



Summer 



175-9 



81-9 



178-5 



251-5 



169-6 



0-09 



0-17 



W. 1 s. 



Autumn 



167-5 



157-8 



328-5 



404-5 



294-6 



0-16 



0-22 



W. 33 S. 



Winter 



118-6 



196-9 



241-1 



303-0 



1621 



009 



0-19 



S. 41 W. 



The Year 



694-4 



521-3 



1033-3 



1416-9 



957-6 



0-13 



0-23 



W. 21 S. 



Spring for the meteorological quarters = March, April, May ; and for the astronomical quarter = Feb- 

 ruary, March, April. 



