I I MPERAT1 RE ON THE MAGNETIZATION OP 8TEEL8, ETC. 



present experiment permits ex- 

 amining tin.' magnetizations at dit- 

 es o 



feront temperatures up to about 

 1200°G, cither by keeping the ex- 

 ternal magnetizing field constant, 

 or in varying fields, by means of a 

 simple magnetometer. 



A magnetizing coil (length 

 40 cm., wound in 10 layers; 

 4stn =394.4 resistance = 1.51 ohm.) 

 was waterjacketed and the inner 

 face of the core protected by thick 

 asbestos paper. A burner (Fig. 

 1) consisting of three branching 

 copper tubes, coated with asbestos, 

 was placed in the coil and fed with 

 gas and air blast. Fine jets of 

 flame (90 in all) issued horizontal- 

 ly, and played on the outer cover 

 of the ferromagnetic ovoid. All 

 the ovoids were 1 cm. thick and 20 

 cm. long, with the demagnetizing 

 factor X =0.0836. They were plac- 

 ed between the projecting knobs 

 in the burner as shown in the 

 figure. A platinum-rhodium and 

 platinum junction was brought in 

 contact with the ovoid at its 

 thickest part, while the rest was 

 insulated with asbestos [taper. 



