. Contributions. // K 37 N. H. WILLIAMS, [SecondISeries. magnetism on open magnetic circuit persisted until a demagnetizing filedof gauss had been applied and then suddenly the residual magnetism,with the magnetic circuit open, fell to lower values. The point at whichit breaks down is the point where the recovery on removing this de-magnetizing field of gauss is equal to the demagnetization due tothe ends when the plug is removed. Fig. 5 shows these relations ingraphic form. Curve A represents the maximum hysteresis curve. Theinercept between A and B is the recovery upon breaking the
. Contributions. // K 37 N. H. WILLIAMS, [SecondISeries. magnetism on open magnetic circuit persisted until a demagnetizing filedof gauss had been applied and then suddenly the residual magnetism,with the magnetic circuit open, fell to lower values. The point at whichit breaks down is the point where the recovery on removing this de-magnetizing field of gauss is equal to the demagnetization due tothe ends when the plug is removed. Fig. 5 shows these relations ingraphic form. Curve A represents the maximum hysteresis curve. Theinercept between A and B is the recovery upon breaking the intercept between B and C is the demagnetization following theremoval of the plug. At the right of point P the demagnetization dueto the ends exceeds the recovery while at the left of P, the recovery is. Fig Fig. 6. eXv2,a.\\or greater. Intercept PQ represents both demagnetization due to the endsand recovery after removal of the field and it is at this point that theresidual magnetism with the gap open ceases to be constant. Theinterpretation of this horizontal portion of curve C seems to be this:that there is a welldefined upper limit beyond which the remanence ofa steel core with exposed ends cannot be made to pass. As has been mentioned, the recovery curves for a given specimen arepractically parallel. For very hard steel the portion of the hysteresiscurve with which we are concerned does not differ much from a straight Nas] STABILITY OF RESIDUAL MAGXETISM. 372 line. If it were exactly a straight line, it would follow that the recoverywould be strictly proportional to the difference between the maximumresidual flux and the residual flux corresponding to the recovery line of Fig. 6 is presented to show how nearly this statrmtiit i,fproportionality approximates the truth. I
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