PEIKCE. — ANOMALOUS MAGNETIZATION OF IRON AND STEEL. 



655 



better. At one time we broke the current by shattering a short piece 

 of glass-hard steel wire introduced for the purpose into the circuit, 

 but we did not discover that this process led to different conclusions 

 from those which we reached with the more convenient key. 



Figure 12. This diagram shows anomalous residual magnetism in the 

 case of a piece (P) of soft Bessemer steel, 12 cm. long and 2.8 cm. in diameter. 

 The full curve was obtained with the cylinder intact as shown at T, the dotted 

 curve, after the specimen had been sUt lengthwise in the manner shown at Q. 



Anomalous Magnetization in Cylinders Formed of Shells 



AND Cores. 



As will appear more clearly in the sequel, many of the lines of po- 

 larization in a short, anomalously magnetized solid cylinder form closed 

 curves wholly inside the metal, and a cut made in the iron in the form 

 of a cylindrical surface coaxial with the surface of the specimen would 

 seriously interfere with this arrangement because there would be a very 

 sensible reluctance at the crack. "We should expect, therefore, that 

 the magnetic characteristics of an, iron cylinder formed of a cylindrical 

 core and a coaxial shell would be in some respects dififereut from that 

 of a solid cylinder, and this is the fact. 



