The Measurement of Magnetic Hysteresis . ith the load had nearly settled down to a permament form. In the first experiments, when the permanent set was about 6 revolutions, the firstapplication of a negative couple due to 200 grammes caused the wire to yieldsomewhat, and when the load of ?—-300 grammes was reached, the yielding was greatenough to cause the vvheel to turn gradually througli half a revolution. In thenext cycle of loachng this effect of a negative couple was small, and it becamemuch smaller for each successive cycle. With the large permanent sets of 20 and 50revolutions the wire
The Measurement of Magnetic Hysteresis . ith the load had nearly settled down to a permament form. In the first experiments, when the permanent set was about 6 revolutions, the firstapplication of a negative couple due to 200 grammes caused the wire to yieldsomewhat, and when the load of ?—-300 grammes was reached, the yielding was greatenough to cause the vvheel to turn gradually througli half a revolution. In thenext cycle of loachng this effect of a negative couple was small, and it becamemuch smaller for each successive cycle. With the large permanent sets of 20 and 50revolutions the wire became so hard that the yielding under a negative couple wasvery small even in the first cycle. The positive couples caused little yielding even inthe first cycle v/ith the permanent set of 6 revolutions. The observations were too numerous to be recorded, except in the form of thecurves in figs. 15, 16. In order to show all the curves on a single diagram, we havetaken a different position of the zero line for B^ and W in each -100 0 ICO Lead prcduning torsion—grammes. 200 2000 500 6600 6C00 6 Rev. GO Rev. :|r=cs;
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