﻿of Ferro- magnetic Elements in Corresponding States. 39 

 Table I. 

 Relation of Residual Magnetic Intensity to Temperature. 



Nickel. 



Iron. 



Cobalt. 



Temp. 

 0°. 



e/9 x . 



I/Io- 



Temp. 

 C°. 



9/9 v 



I/Io- 



Temp. 

 0°. 



ej9 x . 



I/Io- 



21 



•440 



•945 



17 



•272 



•981 



14 



•211 



•985 



50 



•484 



•931 



40 



•293 



•977 



115 



•286 



•984 



76 



'527 



•917 



90 



•342 



•969 



209 



•355 



•975 



107 



•581 



'900 



138 



•386 



•960 



SOO 



•422 



•954 



135 



•618 



•884 



188 



•435 



•949 



390 



•488 



•933 



165 



•661 



•861 



237 



•480 



•936 



472 



•545 



•910 



193 



•707 



•837 



287 



•527 



•921 



560 



•613 



•877 



223 



•749 



•801 



337 



•575 



•902 



615 



•674 



•839 



251 



•791 



•761 



386 



•622 



•877 



747 



•749 



•786 



280 



•835 



•714 



435 



•669 



•842 



1090 



1-000 



... 



310 



•882 



•660 



467 



'700 



'801 









323 



•900 



•630 



530 



'759 



•793 









341 



•929 



•590 



550 



'776 



'793 









352 



•945 



•554 



593 



'818 



•763 









360 



•956 



•545 



623 



•845 



•691 









365 



•965 



•509 



650 



•872 



•654 









367 



•967 



•483 



681 



•901 



•637 









388 



1-000 



(•355) 



700 



725 

 748 

 769 

 778 

 782 

 785 



•920 

 •943 

 •965 

 •984 

 •992 

 •996 

 1-000 



•590 

 •534 

 •462 

 •403 



•374 

 •346 



(•305) 









The dimensions of the wires were : 



Nickel 1st series. 



2nd „ 

 Iron 1st „ 



2nd „ 

 Cobalt 2nd „ 



Length =63 - 5 cm. 

 „ =20-0 „ 

 „ =-750 „ 

 „ =19-4 „ 

 „ = about 10 cm. 



Diameter=0-129 cm. 

 =0-050 „ 

 ,, =0-262 „ 

 „ =0-057 „ 



=about - l cm. 



point of transformation of cobalt. If the magnets are not 

 heated above the critical temperatures the magnetism, which 

 falls at that point to about 30 per cent, of its initial value, 

 remains cyclic and is entirely recovered on cooling. 



The first diagram gives the variation of the fractional 

 magnetic intensity (I/I ) of each of the ferromagnetic metals 

 compared with the temperature in centigrade degrees. 



The curve for nickel is the mean of observations on two 

 nickel wires, the individual observations agreeing very well 

 with each other. Nickel behaves very regularly under 

 increase of temperature, the curve declining smoothly and 

 with increasing rapidity to about 35 per cent, of its original 



