The Measurement of Magnetic Hysteresis . -100 0 ICO Lead prcduning torsion—grammes. 200 2000 500 6600 6C00 6 Rev. GO Rev. :|r=cs;. 20 Rev.^^Sn:^ - loa o ICO Load producing torsion— SCO Fig. 15, J- -*-p-^ *- X w a In these experiments it was found that after the first application of a negativecouple due to 300 grammes the iron had roughly reached a cyclic state, and thus, toavoid confusion, we give only li cycles as continuous curves. For a permanent setof 6 turns 3| cycles were actually gone through, and in each of the other cases ON THE MEASUREMENT OF MAGNETIC HYSTEEESIS. 89 2^ cycl
The Measurement of Magnetic Hysteresis . -100 0 ICO Lead prcduning torsion—grammes. 200 2000 500 6600 6C00 6 Rev. GO Rev. :|r=cs;. 20 Rev.^^Sn:^ - loa o ICO Load producing torsion— SCO Fig. 15, J- -*-p-^ *- X w a In these experiments it was found that after the first application of a negativecouple due to 300 grammes the iron had roughly reached a cyclic state, and thus, toavoid confusion, we give only li cycles as continuous curves. For a permanent setof 6 turns 3| cycles were actually gone through, and in each of the other cases ON THE MEASUREMENT OF MAGNETIC HYSTEEESIS. 89 2^ cycles. In each case the last cycle is indicated by isolated points ; when thepositive load is increasing a + is used, and when the positive load is decreasing a Xis used. In their general forms the curves due to the last cycle for 20 and 50 turns ofpermanent set resemble those obtained after several comparatively rapid cycles oftorsion for 25 and 50 turns of permanent set in § 62. Any close comparison isimpossible on account of the fact that the curves of § 62 do not form closed figures. In the case of 6 turns of permanent
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