'M 



of Valencia produces a SE wind, in the direction of Biarritz an Ë, 

 of Munich a NE, of Neufahrwasser a NW, and of Lerwick a SW 

 wind and furtiier, that, although the distance from Flushing is 

 about the same, Biarritz exercises a much stronger inthience than 

 Valencia. These results are in accordance with the experience afforded 

 by the study of the weather charts, but they give quantitative 

 relations by means of which a calculation of the resulting wind 

 becomes possible. 



With the help of equ. (1) it is possible to demonstrate in a more 

 conspicuous manner the intluence of the gradient direction on the 

 velocity of the wind and the angle of deviation by putting the 

 question: which wind will be caused by or, rather, will be associated 

 with a fictitious distribution where the pressure difference in the 

 whole field is uniform and represented by isobars, successively di-awn 

 in the directions of eight principal points of the compass, and at 

 distances from each other equal to unity (J mm. per degree of 

 latitude;. 



Denoting the distance of a station from Flushing by D, the 

 azimuth of the joining arc by ^1, the azimuth of the gradient 

 by « and the average difference of pressure by ;?, then 



,?- :=: D COS {Ai o) ^i 



where / is to be given successively the values 1 to 5. 



The components of the wind then follow from the values com- 

 puted from (1): 



Wn = iv„-\-^i\ We = >o -\-r,. 



The results of this calculation are given in table II. 

 TABLE II. 



{ Wind i i 



Direction j velocity for ! Direction of Angle of 

 gradient I grad. = 1 j wind : deviation 



I m. p. s. 



N 



NE 



E 



SE 



S 



SW 



W 



NW 



5,43 

 5.29 

 5.53 

 T.21 

 8.35 

 7.55 

 5.56 

 4.90 



N 248° E 

 294 

 349 



35 



67 



97 

 139 

 198 



68° 



69 



79 



80 



67 



52 



49 



63 



