1898-1902. No. 6.1 



TERRESTRIAL MAGNETISM. 



81 



It will be observed that in the table there are columns headed 0-G, 

 which contain the difference between the value deduced from the ob- 

 servations, and the theoretically calculated value for each separate ele- 

 ment; for Professor Ad. Schmidt at Potsdam has on this occasion, as 

 previously on the publication of the observations-results from the first 

 Fram Expedition, been so obliging as to undertake to calculate, on the 

 basis of his Potential Calculation for 1885.0, the theoretical value of 



6 



