43 



BIRKELAND. THE NORWEGIAN AURORA POLARIS EXPEDITION, 1902 1903. 



TABLE LX (continued). 

 Values of Pm for one of the vertical portion of the current. 



From these quantities we can determine, by a simple combination, the distribution of force in 

 systems with a horizontal piece of current of arbitrary length. 



In the following tables we have put together the force-components of three such systems, the length 

 of the arc in the first being 75, in the second 180, and in the third 270. 



w is here always reckoned from the transversal axis. 



TABLE LXI. 

 Values of Po for a current-system corresponding to 



= 75 



Values of PQ for a current-system corresponding to f\n = 75 . 



