1889.] Magnetisation of Iron at High Temperatures. 319 



Curve I shows the relation of induction to magnetising force at 

 the ordinary temperature, the resistance of the secondary coil 

 being O692 ohm. The curve is given to two scales, the scale of 

 induction being the same in each, whilst the scale of magnetising 

 force is magnified twenty-fold in the one as compared with the other. 



Curve II shows the same relation for a temperature of 697 C. to 

 700 C. 



Curve III shows the same thing for a temperature between 727 C. 

 and 720 C. 



