621 



We liave put- 



H 



m 



Fig. 4. 

 = .v.0.815.//„ 



(5) 



q = s . r 



and for 15 amp. q = s =z r = 1. 



The quaiititie.s q, s and r are called the topographical corrections. 



The apparent Curie-constant C" is connected to the true Curie- 

 constant 6' by the formula: C' = qC nud does not depend on the 

 temperature. Fig. 5 siiows that within ihe limits of accuracy of the 

 experiments at both hydrogen temperatures ') tiie same values for 

 C' are found. Unl^' at 5 amp. {Ii„ ;= 3295) where the forces are 

 small and the measurements less accur^ate there exists a larger 

 deviation. 



The values for C" have been smoothed graphically and then the 



C" 

 topographical correction q has been determined from q = — . 



^ 15 amp. 



In the column 10''C the value of 10' (^" corrected with ^ has been 



'} The circles refer to 2Üo,42 K., the squares to 13°,98 K. 



