HALL AND CAMPBELL. — MAGNETIC EFFECTS IN SOFT IRON. 



GG7 



It will be seen that K, which = our ;,7'e and Zahn's — Q, as calculated 

 from the formula of Moreau and given in the fourth column agrees in 

 sign with K as observed by Nernst in every case except that of cobalt, 

 and that in this case direct observation by Moreau himself gives the 

 same sign which his formula gives. In other words, according to 

 Moreau his own formula gives the right sign for K in every case. 

 Zahn, however, agrees with Nernst in his observation of the sign of 

 the Nernst effect in cobalt. 



Moreau finds the Voigt formula, or at least the expression , to 



give the same signs as his own formula in all the cases examined except 

 those of iron and steel, but I am inclined to the opinion that he has 

 made a mistake of sign in the use of the Voigt formula. It seems to 

 me that the Voigt formula gives the right sign for K in iron and 



2* C. R., 130, 124 (1900). 



