on the Magnetic Properties of Iron, 



19 



Temperatu re 



before experiment 



468° C. 



Temperature 



after experiment 



468° 0. 



Magnetic 



Permea- 



1 Force 



bility 



(H). 



GO- 



041 



256 



0816 



256 



1-22 



262 



163 



282 



2-04 



304 



245 



343 



3-26 



433 



4-08 



649 



489 



895 



5-71 



1054 



6-52 



1047 



7-34 



1019 



8-16 



987 



979 



887 



1223 



756 



16-31 



603 



2243 



453 



Temperature 



before experiment 



589° C. 



Temperature 



after experiment 



593° C. 



Magnetic 

 Force 



_m_ 



0-16 



033 



065 



0-816 



1-22 



1-63 



204 



2-45 



2-85 



326 



4 08 



4-73 



5-71 



660 



7-34 



8-97 

 12-23 

 16-31 



Permea- 

 bility 



491 



491 



513 



538 



593 



676 



996 

 1245 

 1538 

 1645 

 1615 

 1513 

 1353 

 1211 

 1130 



946 



725 



562 



Temperature 



before experiment 



630° 0. 



Temperature 



after experiment 



634° C. 



0-082 



727 



0-41 



735 



0-816 



838 



1-22 



1010 



1-47 



1203 



1-79 



1501 



2-04 



1775 



245 



1911 



2 65 



1917 



2-85 



1908 



3-26 



1844 



4-08 



1645 



4-89 



1437 



734 



1030 



12 23 



665 



Temperature 



before experiment 



649° C. 



Temperature 



after experiment 



649° C. 



0-082 



0-163 



0-41 



816 



122 



1-47 



1-79 



2-04 



2-45 



2-65 



3 26 

 408 



4 89 

 7-34 



910 



940 



994 



1137 



1479 



1774 



2067 



2121 



2044 



1979 



1719 



1436 



1229 



864 



In the case of iron (fig. 6) it was seen that the curves 

 corresponding to different temperatures could be made to 

 practically coincide by plotting to suitable scales; this is not 

 the case with the tungsten alloy. 



It will be seen from fig. 10 that heating has a much greater 

 effect on the permeability during the first part of the process 

 of magnetization than it has under stronger magnetic forces. 

 The initial permeability when the metal is cold is slightly 

 above 100, while at a temperature of 655° C. it is 1026; the 

 maximum permeabilities obtained at the same temperatures 

 were about 650 and 2140 respectively. 



02 



