. Contributions. apply-ing the correction to the current curve. The flux and its time rate ofvariation are behind the current in phase at the highest points of thecurves. If the fraction chosen be too small, the flux will be behind thecorrected curve while if the fraction chosen be too large the flux curve will Vol. 5. J STABILITY OF RESIDUAL fall ahead of the new curve in piuise at the highest points. A value ofthe fraction is chosen which places the corrected curve in phase at thehighest point with the flux curve and then the ordinates of this new curverepresent the result
. Contributions. apply-ing the correction to the current curve. The flux and its time rate ofvariation are behind the current in phase at the highest points of thecurves. If the fraction chosen be too small, the flux will be behind thecorrected curve while if the fraction chosen be too large the flux curve will Vol. 5. J STABILITY OF RESIDUAL fall ahead of the new curve in piuise at the highest points. A value ofthe fraction is chosen which places the corrected curve in phase at thehighest point with the flux curve and then the ordinates of this new curverepresent the resultant or actual field intensity applied to the 9 shows the corrected curve with points indicated by the small correction applied to each ordinate of the curve was 13 per cent, ofthe corresponding ordinate of the secondary curve. The hysteresis forthis specimen, as shown by the corrected curves, is found to diflfcr verylittle from that shown by the other specimens for an L-quA change (jf Fig. 9. In order to further test this method of correcting for eddy currents, asolid magnet of tempered steel was used. Eddy currents would certainlybe large in this case, but it was arranged to reduce end eflects to a negli-gible magnitude by filling the small air gap with a carefully fitted blockof iron. Fig. 10 shows the results. The curve plotted from the correcteddata shows no more hysteresis than was found for the wire ring. To obtain further data on the relative magnitude of the hysteresisin steel and soft iron for the kind of cycle here considered, a ring of softiron wire was used. Wire ha\ing a diameter of .96 mm. was wire of specimen A had a diameter mm. If size of wire were allthat determined the eddy currents eflfect, we should be assuretl of lessdisturbance from them with this new ring than was experienced withspecimen A. However, in getting the total hysteresis cur\c this is notthe case. With soft iron the hysteresis curve is nearly paral
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