2881.     ROGERS, B. A., WENTZEL, K., AND RIOTT, J. P.  Magnetic Methods for Determining Carbon in Steel.  Trans. Am. Soc. Metals, vol. 29, 1941, pp. 969-983; Chem. Abs., vol. 36, 1942, p. 720.

        Magnetic saturation and C content can be correlated accurately at 0.50-1.10% C.  Samples containing more than 0.40% C were quenched from above 700; other C contents required slow cooling.  When both types of heat treatment were used, samples containing 0.10-1.10% C could be tested.  The apparatus is described.