Tables 561-567 



469 



MAGNETIC PROPERTIES OF METALS 



TABLE 561.— Cobalt at 0° and 100" C TABLE 562.— Nickel at 0° and 100° C 



TABLE 563. — 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. t The 

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

 tensity of 1000 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 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. 



TABLE 564. — Lowmoor 

 Wrought Iron 



TABLE 565.— Vicker's 

 Tool Steel 



TABLE 566.— Hadfield's 

 Manganese Steel 



TABLE 567. — Saturation Values for Steels 



I H 



Bessemer steel containing about 0.4 per cent carbon ... 17600 



Siemens-Marten steel containing about 0.5 per cent carbon ' 18000 

 Crucible steel for making chisels, containing about 0.6 per 



cent carbon '947° 



Finer quality of 3 containing about 0.8 per cent carbon . . 18330 



Crucible steel containing 1 per cent carbon 19620 



Whitworth's fluid-compressed steel , 18700 



1770 

 1660 



14S0 

 1580 

 1440 

 1590 



398S0 

 3SS60 



38010 

 38 1 90 

 37690 

 38710 



2.27 

 2.16 



'•95 



1.92 



2.07 



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

 Smithsonian Tables. 



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



