Magnetization of Iron in Bulk. 627 
curve I, indicates as before the rise from zero after the core 
has been already magnetized in the same direction ; I, when 
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Fic. 3.—Rise of Current Magnetizing Cast Steel Ring. 
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PERMEABILITY 
the magnetization is-being reversed. The following are the 
details of construction affecting the curve :— 
HoEns OW primary winding . ... . OY 
Resistance of primary winding . . . ‘75 ohm. 
Reluctance of core ((/A calculated). . °15/p. 
Calculated inductance w=100 . . . L='3l henry. 
Weight of iron magnetized . . . Ot0 4b. 
Maximum value of H applied to core . 67 
Calculated time constant . . . . . ‘41 second. 
