GB 135274 A
135,274. Pease, E. L. Nov. 18, 1918. Gills for tubes.-Heat-interchanging apparatus consists of vertical tubular members both the internal and external surfaces of which are utilized as air-heating surfaces, the outer one also constituting a heatradiating surface. These heating- columns are secured in good metallic contact with a vertical series of horizontal heating-tubes through which steam may be passed, and are arranged with spaces between each vertical tube. The heating- columns are usually constructed of sheet metal, but may be of cast-iron. Several examples are described, in one of which a series of horizontal tubes a, supplied with steam &c. from a pipe d through a header h and fitted with baffles b, b<1> to ensure correct flow of heating-fluid to the outlet g, are provided with a number of vertical fattened tubes smaller at the lower end, as shown in Fig. 3, arranged with spaces between them. The vertical tubes are in close metallic contact with the horizontal tubes and may be fitted with diaphragms k of various lengths, also in good contact with the horizontal tubes a. In other examples, the vertical tubes are completely enclosed in a case, air being supplied at one end and exhausted at the other end. In place of vertical tubes, bent plates may be used as shown in Figs. 6 and 7. Specification 113,298 is referred to.