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The production of hydrogen for commercial purposes has naturally been toward the development of methods which insure low cost and, the equipment designed is usually for permanent installations. Greatest efficiency in the production of hydrogen for military service involves processes which permit of easily transportable generating equipment. Ample available supplies of chemical sub stances and purity of gas. It is often practicable for the Army to use hydrogen plants of commercial types, shipping the gas compressed in cylinders, so that it is important that officers assigned to the lighter-than-air service become familiar with all practicable methods.