US PATENT SUBCLASS 122 / 76
.~.~.~ 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}
75  DF  .~.~ Return fire tube {2}
76.~.~.~ Drop water firebox {1}
77  DF  .~.~.~.~> Internal water tube

DEFINITION

Classification: 122/76

(under subclass 75) Devices having a water walled firebox depending from the boiler so arranged that the products of combustion pass directly through the lower tubes and return to the front of the boiler through the upper tubes and are discharged to the outlet flue at this point.