146 



BIRKEI.AND. THE NORWEGIAN AURORA POLARIS EXPEDITION, 1902-1903. 



Wittielmshaven Octbr G, 1902 



f 



other words the forces converge from all 

 directions towards some region or other in 

 the Atlantic, we are unable to say with 

 certainty, as we lack material from the more 

 southerly regions. A knowledge of the con- 

 ditions in West Africa and the east of 

 South America would be of special impor- 

 tance. 



We note the fact that the effect of the 

 force seems to keep rather constant in the 

 same direction as the West European and 

 American current-arrows, while the strength 

 of the field decreases very rapidly perpen- 

 dicular to the direction of the arrows out- 

 wards from the vortex-centre. Thus in 

 Europe the effect decreases very rapidly 

 eastwards, the force being very small both 

 at Pawlowsk and Tiflis. At Kaafjord and 

 Sitka also, the force is small. 



Among the other Norwegian stations, 

 only Axeleen can show a perturbing force 

 that is at all great; but there its direction 

 is almost due north, and it thus does not 

 appear to join the field of force in more 

 southerly latitudes. 



Fig. 6 4 . 



TABLE XXII. 

 The Perturbing Forces on the 6th October, 1902. 



