(under the class definition) Subject matter relating to the structure of the steam receiving and storing chambers for boilers with which the steam main communicates which do not come within the definition of other subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
88, and 305, for steam and water drums for water tube boilers.
463, and 509, for steam collecting chambers located within the body of the boiler.
486, for steam domes or chambers having means for superheating the steam.