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This paper outlines the advantages to be gained by making a boiler with two furnaces instead of one. These advantages comprise a lower furnace exit-gas temperature in a boiler provided with two furnaces than in a boiler with a single furnace, for the same rate of heat liberation per unit of furnace volume. Further, it is pointed out that, when a radiant superheater is installed in one of the furnaces, the final temperature of the steam may be controlled over a wide range of steaming by suitable adjustment of the rate of firing in both furnaces. A particular boiler generating 750,000 lb of steam per hr with two furnaces, fitted with both radiant and convection superheaters, is described and some particulars of its operation are given. Other boilers with two furnaces and provided with radiant superheaters are also illustrated and described.

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