Magnetic Permeability of various Alloys of Iron. 



119 



Table XIV. — Ctiromium, Nickel- Chromium, and other Steels. 



Table XIV. — (continued). 



It will be observed that a 3j per cent, chromium steel has a high coercive 

 force and low permeability, but when the chromium is increased to 9^ per cent, 

 the coercive force is diminished and the jDermeability increased, whilst the max. 

 induction remains practically the same. Wliether this anomalous behaviour be 

 due to the higher carbon in the latter specimen, or some accidental difference in 

 annealing, we cannot say. Adding nickel to a low chromium steel improves it 

 magnetically, the max. induction is increased, and the permeability very largely 

 so, as in sjjecimen 1286 A, which has under 1 per cent, of chromium. As the 

 quantity of chromium increases in the next two specimens, the nickel remaining 



