MAGNETIZATION AND MAGNETIC CHANGE OF LENGTH. 



43 



The magnetization of iron and nickel at high temperatures is 

 so well known that it is superfluous to give all the numerical 

 data obtained by our experiment. Hence in the above table, the 

 numbers for iron and nickel are limited to those at very high 

 temperatures, in which they become of interest. 



Swedish iron. The magnetization in constant temj)erature 

 was measured at 20 different temperatures in ascending as well 

 as descending stages ; the curves of magnetization were then 

 plotted against the internal field. These curves were cut by an 

 ordinate of constant field. The curves of magnetization in a 



