3940.  WILLIAMS, N.H., AND HUMPHREYS & GLASCOW, LTD. Manufacture of Water Gas or Gas Consisting Largely of Carbon Monoxide and Hydrogen. British Patent 616,811, Jan. 27, 1949. Fuel Abs.,vol. VI, No. 1, abs. 200; Chem. Abs., vol. 43, 1949, p. 4837.

In a cyclic process of gas manufacture in which air and steam and, if desired, other gases passed upward through the generator are preheated in a heat exchanger by the gaseous products of their respective upward passage through the generator, cyclic fluctuations in the temperature of the gaseous products and the undecomposed steam passing from the top of the generator to the heat exchanger are reduced in extent and rapidity, and more constant conditions at the hot end of the heat exchanger are insured by passing the uprun gaseous products from the generator 1^st through a regenerator in a constant direction and then through the heat exchanger.