3324.     TAMMANN, G., AND EWIG, K.  [Contribution to the Knowledge Concerning Cementite.]  Ztschr. anorg. Chem. vol. 167, 1927, pp. 385-400; Chem. Abs., vol. 22, 1928, p. 570.

        Temperature-magnetization curves of C steels, ranging 0.15-3.9% C, indicate an abrupt lowering in magnetizability at 200°-220°.  This lowering is proportional to the C content and, therefore, to the Fe₃C content.  Lowering of the magnetizability during the pearlitic transformation becomes less with increasing C content.  Since Fe₃C loses its magnetic properties at 210°, some of it was heated to various temperatures and temperature-magnetization curves were obtained.  After heating Fe₃C for 5 hr. at 500°, the curves showed no noticeable decrease at 210°.  This indicates that after heating at 500° for 5 hr., Fe₃C is completely decomposed into Fe and C.  The probable effects of dissolved gaseous impurities, and of including the Fe₃C in a structure of ferrite (as in steel), upon the decomposition temperature of Fe₃C are discussed.  The heat of transformation of Fe₃C (magnetic=nonmagnetic variety) cannot exceed 0.02 cal. per gm. With a dilatometer the increase in volume at the temperature of the magnetic transformation (200°-215°) was 0.0714 mm.³ per gm. of Fe₃C.  This change in volume should produce noticeable changes in the physical properties of steels and, also, in white cast Fe.  A study of the effect of the addition of Si, Mn, Ti, Al, and B upon the magnetic transformation temperature was undertaken.  Al and Ti were without effect.  5% Si has little effect; 14% Si lowers the transformation temperature 100°; 3% Mn lowers this temperature 100°; 0.5% B lowers the temperature 200°.

        TARAMA, K.  See abs. 1892, 1915, 1916, 1917, 1918, 1919, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 2196, 2197, 2200, 2201, 2202, 2203, 2204.

        TARAMA, K., TATSUKI, Y., KASAI, K., AND TAKEGAMI, Y.  Synthesis of Benzine From Carbon Monoxide and Hydrogen.  LXVIII.  Analysis of the Synthetic Oil by Fractional Distillation.  (2).  See abs. 1904.

        TARAMA, Y.  See abs. 1930.

        TARN, W. H.  See abs. 46, 51, 53c.

        TATARSKII, E. S.  See abs. 3267.