US PATENT SUBCLASS 122 / 195
.~ Water tube

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

*  DD  HORIZONTAL CYLINDER {6}
195.~ Water tube {7}
*  DD  .~.~> Feed heater {1}
197  DF  .~.~> Lateral-longitudinal
198  DF  .~.~> Lateral-vertical {1}
200  DF  .~.~> Over fuel grate
201  DF  .~.~> Subjacent internal fire tube
202  DF  .~.~> Trapped circuit
*  DD  .~.~> Water grate {5}

DEFINITION

Classification: 122/195

(under the class definition) Horizontal cylindrical boilers having some form of water tubes, water chambers, or drums in communication therewith. The cylindrical boiler may or may not be provided with fire tubes or flues.

SEE OR SEARCH THIS CLASS, SUBCLASS:

45, 47, 48, 49, 50, and 51+, for various types of horizontal fire tube boilers provided with water tubes, waterwalls, drums, or chambers.

136+, for horizontal cylindrical boilers having large flues therein and provided with water tubes, water walls, drums, or water heating chambers.