424.    CAMPBELL, E. D., FINK, W. L., AND ROSS, J. F.  Iron-Iron Carbide Equilibrium in Dry Hydrogen at 950°.  Jour. Iron Steel Inst. (London), No. 108, II, 1923, pp. 173-178; Chem. Abs., vol. 18, 1924, p. 612.

                  Results of several experiments to determine the amount of C transferred from a solution of carbides in Fe to one of lower concentration.  The loss in weight of the samples indicates formation of a solution of Fe carbides, which then react with H₂ to form gaseous hydrocarbons.  It is suggested, from the small amount of greasy substance found in the reaction tubes, that the gaseous C compounds are not entirely CH₄ but that a part at least were hydrocarbons of higher molecular weight.