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<p>A series of iron-carbon alloys with carbon content varying from 0.018 to 1.60 per cent, was subjected to two kinds of heat treatment; one group was first hardened by quenching from temperatures above the critical range and then drawn back to successively higher temperatures; another set was annealed /b in vacuo./ After each heat treatment, magnetisation curves and hysteresis data were taken, and in most cases the magnetic property is graphed with the drawing temperature. The hardened alloys when drawn back to successively higher temperatures showed marked changes in the normal induction, residual induction, and coercive force which correspond to transformations of the material. The annealed specimens were measured by a method dealt with in another paper [see%2
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