(under the class definition) Boilers having means for passing exhaust steam through conduits within the boiler or in surface contact therewith or for passing live steam generated in the same boiler or in another boiler into the water in the boiler. This subclass includes processes for getting up steam by the injection of live steam from one boiler into another boiler.
SEE OR SEARCH THIS CLASS, SUBCLASS:
27, and 28, for boilers heated by slag or hot brick or bars of iron.
31.1, for boilers heated by the injection of a liquid of a kind that does not mix with the water in the boiler.
32+, for boilers heated indirectly by another hot fluid.
407, for injector circulation systems.
463, for similar structure in steam treating superheaters. 509, for submerged chambers.
