18^0.] Magnetic Properties of Alloys of Nickel and Iron. 3 



The only noteworthy features are that the coercive force is ob- 

 viously somewhat considerable, and that the maximum induction is 

 great greater than that of the more nearly pure iron. 



In Curve 2 are shown the results of induction in terms of the 

 temperature for a force of 0'50. 



CUBVK 2. 

 1 per cent. Nickel. Magnetising Force, 0'50. 



B. The following is the analysis of the sample : 



Fe. Ni. C. Mn. S. P. Si. 



94-799 4-7 0-22 0'23 0014 0-037 trace percent. 



We have here results of induction in terms of temperature for a 

 magnetising force of 0'12, shown in Curve 3, and for comparison 



CUBVB 3. 



4'7 per cent. Nickel. Magnetising Force, 0' 12. 



750 800 350f 



therewith the results of rate of heating and cooling in Curves 4 and 

 5 respectively. The experiment with rising temperature was made 

 by simply observing with a watch the hour at which the temperature 

 attained successive values whilst the piece was in the furnace ; the 

 cooling experiments were made in exactly the way described in 

 ' Phil. Trans.,' A, 1889, p. 463 ; in the experiment with rising tempera- 

 ture, however (Curve 4), the ordinates are the actual temperatures, not 



B 2 



