US PATENT SUBCLASS 122 / 74
.~.~.~ Drop water firebox

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
*  DD  .~.~ Return and reverse {1}
74.~.~.~ Drop water firebox

DEFINITION

Classification: 122/74

(under subclass 51) Devices having a drop water firebox so arranged that the products of combustion pass a plurality of times through the boiler or underneath, through or over the boiler, and are discharged at the outlet flue located at the end of the boiler farthest from the firebox.

SEE OR SEARCH THIS CLASS, SUBCLASS:

73, for tubes merely projecting into a firebox.