(under subclass 235) Water tube boilers whose tubes are so arranged as to cross one another and includes cross tube boilers that are not specially provided for by other subclass definitions.
(1) Note. There is a close analogy between the cross loop type and the zigzag and the cross tube type of water tube boilers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99, for water tubes straddling the fuel chamber.
145, 146, 147, 176, 177, 253-257, 278, 311, 326, and 329, for different types of boilers provided with cross water tubes.
