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<p>This is an extension of the work by Burgess and Scott [Abstract 1916A01396] on the thermoelectric measurement of the critical ranges of pure iron. The material used was an especially pure series of iron-carbon alloys made from vacuum fused electrolytic iron. Characteristic curves showing the changes in the thermoelectric properties of eight samples varying in carbon content up to 1.54% are given for temperatures up to 1150 degrees . The A/sub 2/ transformation was found to be constant at 768 degrees  for heating and cooling in all alloys having a carbon content up to 0.45, but it did not appear in alloys of a higher carbon concentration. The characteristics of the curves obtained indicate that the A/sub 2/ transformation is of
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