226. ---------------. [ BERTHELOT, C.] [Metallurgical Problems Presented in Making Hydrogenation Tubes and Cracking Chambers.] Rev. mét., vol. 33, 1936, pp. 566-573, 619-626, 677-690, 727-746; Chem. Abs., vol. 31, 1937, p. 1738.

226. ---------------. [ BERTHELOT, C.] [Metallurgical Problems Presented in Making Hydrogenation Tubes and Cracking Chambers.] Rev. Mét., vol. 33, 1936, pp. 566-573, 619-626, 677-690, 727-746; Chem. Abs., vol. 31, 1937, p. 1738.

Phenomena taking place during working of the equipment used for hydrogenation and cracking are described and methods for meeting them suggested. The qualities required in metals for the above uses are summarized. A survey of published data is given.