m 



Tlie lengtli D and the azimntli A of the arcs joiiiiiiK Flushing 

 and the other stations are : 



Denotinfï the deviations from the average values of (he pressure 

 differences b}- ,7'i, a\ . . . a\, and those of the north- and east com- 

 ponents of the wind, by .r, and ,v., and further assuming that a linear 

 relation is justified we can put: 



a-'y = b^,x, -f 6,,.ï, + . . . + ó.^.i', . 

 The treatment was the same as explained in a previous paper 



and the following results were obtained: 



r„ = + 0.383 r,, = — 0.456 a^ = 8.47 mm. 

 j-,3 = — 0.185 ;•„ = + 0.256 o, = 7.15 „ 

 r„ = — 0.354 /■,, = + 0.737 «, = 4.57 ., 

 r,, = + 0.297 r,„ = + 0.300 0, = 7.72 „ 



r,, = 4- 0.576 r„ = — 0.561 a, = 8.97 „ 

 r„ = — 0.116 r,. = + 0.313 ö„ = 4.55 m.p.s. 

 /',, = — 0.201 )\', = + 0.765 (J, — 6.01 

 r„ = + 0.290 ?•,; = + 0.522 

 r„ = — 0.491 r,; = — 0.375 



)•,, — -f 0.197 r,'. — - 0.463 

 The condition equations then become: 



a-, = — 0.134 j\ + 0.002 .r, + 0.537 .r, + 0.061 .1;, — 0.123 ,/•. 



a', = 4- 0.089 ,/■, -f 0.426 ,r, + 0.293 .r, — 0.227 r, ^ 0.155 .c, 



The general correlation coefticient of the first equation (N. com- 

 ponent) is 7^1=0.825, of the second equation (E. component) /?=0.870. 

 It follows from these results that the actual pressure differences, 

 deduced from observations made at 5 circumjacent stations enable 

 us to account for the wind blowing in the centre to a degree of 

 85V(| or, in other words, the expected deviation from the mean value 

 with an average uncertainty of ö,, ::= ± 4.55 and o^ = ± 6.01 as a 

 first, rough approximation of the wind components is improved by 

 equation (1) with 



— 43' 



_ per cent. 



It appears from eijii. (1) that a positive gradient in the direction 



(1) 



