82 AKSEL S. STEEN. TERRESTRIAL MAGNETISM. 



the magnetic elements for the four points indicated by the geograpliical 

 coordinates of the four stations. 



The differences given in the table (observed value minus calculated 

 value) suffer, however, from considerable uncertainty; for in the first 

 place the theoretical values are calculated for the period 1885.0, while 

 the observed values are for 1899—1902, and the differences thus con- 

 tain a not inconsiderable secular change, which it has not been 

 possible to take into account. 



In the next place, as I have already pointed out in the Introduction, 

 the magnetic observations of the 2nd Fram Expedition were made under 

 very unfavorable circumstances, the instrumental equipment, in parti- 

 cular, having been far from satisfying the demands made by observations 

 as near the magnetic pole as the Stations are situated. 



Printed 28 Januar 1907. 



