109. ------. [BADISCHE ANILIN- UND SODA-FABRIK] [Process and Apparatus for Carrying Out Operations Employing Hydrogen Under Pressure and at High Temperature.] French Patent 441,695. Mar. 23, 1912. Jour. Soc. Chem. Ind., vol. 31, 1912. p. 922.

Such operations performed under pressure and at high temperatures, such as the synthesis of NH₃, can be carried out in vessels provided with special strengthening appliances, although the wall of the interior vessel in which reaction takes place is composed of some material, such as Fe, free from C, Ni, Ag, which is incapable of offering by itself sufficient mechanical resistance to the conditions imposed by the process but also provided whereby the H₂ that diffuses through the wall of the vessel can escape without meeting with any great resistance.