PATENT

3429. ----- [SOCIÉTÉ L’AIR LIQUIDE.].  Synthetic Ammonia.  British Patent 268,722, Mar. 31, 1926.  Chem. Abs., vol. 22, 1928, p. 1444.

Specifies an apparatus in which heat is conveyed from hotter to cooler parts of the catalytic mass by reaction gases before they come into contact with the catalyst.