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.