TABLES 307-313. 



MAGNETIC PROPERTIES OF METALS. 

 TABLE 307. - Cobalt at 100 0. TABLE 308. -Nickel at 100 0. 



293 



TABLE 309. Magnetite. 



The following results are given by Du Bois * for a specimen of magnetite. 



Professor Ewing has investigated the effects of very intense fields on the induction in iron and other metals.f The 

 results show that the intensity of magnetization does not increase much in iron after the field has reached an in- 

 tensity of looo c. g. s. units, the increase of induction above this being almost the same as if the iron were not 

 there, that is to say, dBj dff is practically unity. For hard steels, and particularly manganese steels, much higher 

 forces are required to produce saturation. Hadfield's manganese steel seems to have nearly constant susceptibility 

 up to a magnetizing force of 10,000. The following tables, taken from E wing's papers, illustrate the effects of 

 strong fields on iron and steel. The results for nickel and cobalt do not differ greatly from those given above. 



TABLE 310. Lowmoor 

 Wrought Iron. 



TABLE 311. Vlcker's 

 Tool Steel. 



TABLE 312. - Hadfield's 

 Manganese Steel. 



TABLE 313. -Saturation Values for Steels of Different Kinds. 



* " Phil. Mag." 5 series, vol. xxix. 



t " Phil. Trans. Roy. Soc." 1885 and 1889. 



