(under the class definition) Boilers in which the liquid flows over the heating surface of the boiler in a thin stream and occupies only a limited portion of the boiler space.
SEE OR SEARCH THIS CLASS, SUBCLASS:
218, and 242+, for capillary tubes.
258, for allied art.
501+, for displacing elements in tubes causing the liquid to spread in a thin film.
SEE OR SEARCH CLASS
126, Stoves and Furnaces, 359, for similar structure in stoves.
