606 



SOLUTION OF THE EQUATIONS. 



Comparison of the Values of the Magnetic Constants in British Units, as 

 determined (1) by Gauss, (2) by Erman, (3) by Adams for 1845, (4) by 

 Adams for 1880, with their yearly rate of increase from 1845 to 1880. 



The multiplier for the conversion from British units into c.G.s. units is 0-046108. 



It will be seen on examining these Tables for the period 1845 



(1) That g and g are numerically very much larger than g.. 



(2) That the values of g? from the same equations differ greatly 

 according as g is or is not included, the value of g being '0276 when 

 g is included, and '0124 when g is excluded. 



(3) It also appears from the comparison of the solutions when the 

 equations of condition are included up to 77% latitude with the solutions 

 above (i.e. stopping at 67% latitude), that g^= '0126 in the first case, and 



- '0276 in the second case, and that this discrepancy is partly due to the 

 fact that the sum of the absolute terms in the final equation for g. is 



+ '08815 when we stop at latitude 67%, and -'07184 when we proceed to 

 latitude 77%. Hence a wide variation in the value of g," is to be expected 

 in the two cases, even when g is included in both sets of equations. 



