TABLE 474.— MAGNETIC PROPERTIES OF METALS 



457 



Nickel at 0° and 100°C 



Cobalt at 0° and 100°C 



H S I B n 



200 106 848 10850 54.2 



300 116 928 11960 39.9 



500 127 1016 13260 26.5 



700 131 1048 13870 19.8 



1000 134 1076 14520 14.5 



1500 138 1104 15380 10.3 



2500 143 1144 16870 6.7 



4000 145 1164 18630 4.7 



6000 147 1176 20780 3.5 



9000 149 1192 23980 2.6 



At 0°C this specimen gave 



the following results : 



7900 154 1232 23380 3.0 



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

 S = Magnetic moment per gram. / = Magnetic moment per cm 3 . 



Magnetite * 



H I B n 



500 325 4580 9.16 



1000 345 5340 5.34 



2000 350 6400 3.20 



12000 350 16400 1.37 



Professor Ewing has investigated the effects of very intense fields on the induction in iron and 

 others metals. The results show that the intensity of magnetization does not increase much in 

 iron after the field has reached an intensity of 1000 cgs units, the increase of induction above this 

 being almost the same as if the iron were not there, that is to say, dB/dH 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 Ewing'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. 



158 Hicks, Laurence C, Nickel-iron alloys for magnetic circuits, Electrical Manufacturing, January 

 1946. 



SMITHSONIAN PHYSICAL TABLES 



