Pressuee of the Wind. 



299 



Times which the Wind blew from the different Points of the Compass. — The wind blew most frequently from 

 the SW., and least so from SE. by E. ; the number for the former, from 12 daily observations, being 403, and. 

 for the latter, 1. If we take the sums of the times from 12 observations, for the five points SSW. to WSW., 

 corresponding to SW., from WSW. to WNW., corresponding to W., and so for the others of the 8 principal 

 points, we find that the number of times which the wind blew was the maximum at SW., a secondary minimum 

 at NW., a secondary maximum at NE., and the minimum at SE. The sums are as follow : — 



SW. 



w. 



NW. 



N. 



NE. 



E. 



SB. 



s. 



963 



344 



208 



250 



476 



166 



55 



281 



The wind blew twice as often from the points included between N., W., and S., as from the opposite semi- 

 circle N., E., and S. 



Sums of the Pressures with which the Wind blew from the different Points of the Compass. — The greatest sum 

 is that for SW., being, from 12 observations, 381 lb., and the least that for SE. by E., being 0-3 lb. Summing 

 the pressures for each five points, including the 8 principal points as above, we have, for 12 observations, — 



SW. 



w. 



NW. 



N. 



NE. 



E. 



SB. 



s. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



834-5 



328-3 



252-9 



204-6 



236-5 



114-3 



40-8 



238-7 



The sums of the pressures are, therefore, greatest about SW. ; they diminish round by W. and NW. to N., 

 where there is a secondary minimum, a secondary maximum occurs about NE. ; the sums then diminish to SE., 

 about which they are the minimum, increasing from thence to SW. 



Mean Pressure of the Wind while blowing from the different Points of the Compass. — The mean pressure of 

 the wind was greatest while blowing from WNW,, being 1-72 lb., and least while blowing from the opposite 

 point ESE., being 0-20 lb. If the sums of the pressures about the 8 principal points be divided by the times 

 which the wind blew about the same points, we obtain the following means : — 



SW. 



w. 



NW. 



N. 



NE. 



E. 



SB. 



s. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



0-87 



0-95 



1-22 



0-82 



0-50 



0-69 



0-74 



0-85 



The mean pressure with which the wind blows is therefore greatest about NW., it becomes less at the 

 N., and is least at NE., from which point it increases gradually by SE., S., SW., and W., to the maximum 

 atNW. 



TABLE XXXII. — Sums of the Pressures of Wind in Table XXXI. resolved for each Hour into the 

 Four Cardinal Points of the Compass, together with the Value and Direction of the Resultant. 







Resolved Sums in 







Resultant. 



Hour Gottingen 

 Mean Time. 

































N. 



E. 



S. 



W. 



Sums. 



Means. 



Directions. 





lb. 



lb. 



lb. 



lb. 



lb. 



lb. 







\S^ 



33-3 



18-4 



61-6 



71-9 



60-5 



0-44 



W- 28 S. 



20J> 



34-8 



18-0 



49-5 



69-3 



53-4 



0-32 



W. 16 S. 



22'^ 



44-3 



24-5 



63-6 



89-2 



67-5 



0-33 



W. 17 S. 



0'' 



60-2 



27-4 



76-0 



108-2 



82-3 



0-35 



W. 11 S. 



2h 



55-1 



34-3 



88-2 



110-8 



83-4 



0-33 



W. 23 S. 



4h 



540 



34-4 



67-9 



91-3 



58-6 



0-24 



W. 14 S. 



G^ 



420 



25-4 



60-9 



75-3 



53-4 



0-25 



W. 21 S. 



8» 



31-9 



16-3 



47-6 



61-0 



47-4 



0-28 



W. 19 S. 



\Qi^ 



23-6 



12-6 



47-4 



54-1 



47-8 



0-38 



W. 30 S. 



Sum of 9 Obs. 



378-7 



211-0 



562-2 



730-4 



550-9 



0-32 



W. 19 S. 



Sum of 12 Obs. 



469-2 



257-1 



737-5 



948-1 



741-3 



0-34 



W. 21 S. 



The mean resultants are obtained on dividing the sum resultants by the number of times which the wind blew. 



