Boilers

Claim 1

A BOILER COMPRISING A CYLINDRICAL BOILER SHELL, FRONT AND REAR TUBES SHEETS SECURED TO SAID SHELL ADJACENT THE OPPOSITE ENDS THEREOF, A COMBUSTION TUBE EXTENDING THROUGH SAID TUBE SHEETS, THE AXIS OF SAID COMBUSTION TUBE BEING LATERALLY OFFSET A SUBSTANTIAL DISTANCE FROM THE AXIS OF SAID BOILER SHELL TOWARD ONE SAID SIDE OF SAID BOILER SHELL, ONE END OF SAID COMBUSTION TUBE PROJECTING BEYOND THE ADJACENT TUBE SHEET TO DISPOSED ONE END THEREOF ESSENTIALLY FLUSH WITH THE END OF SAID SHELL AND BEING ADAPTED TO DETACHABLY SUPPORT A BURNER, FIRST AND SECOND GROUPS OF FIRE TUBES EXTENDING BETWEEN SAID TUBE SHEETS IN THE REGION BETWEEN SAID COMBUSTION TUBE AND THE OTHER SIDE OF SAID BOILER SHELL, THE UPPERMOST OF SAID FIRE TUBES BEING SUBSTANTIALLY AT THE LEVEL OF THE TOP OF SAID COMBUSTION TUBE, A FRONT COVER SWINGABLY MOUNTED AT THE OTHER SIDE OF SAID BOILER SHELL FOR ENGAGEMENT WITH THE END OF SAID SHELL AND THE END OF SAID COMBUSTION TUBE AND EXTENDING OVER SAID FIRST AND SECOND GROUPS OF THE TUBES AND AROUND A PORTION ONLY OF SAID COMBUSTION TUBE, WHEREBY SAID FRONT COVER MAY BE OPENED WITHOUT DETACHING SAID BURNER FROM SAID COMBUSTION TUBE AND A PAIR OF REAR DOORS MOUNTED AT THE REAR OF SAID BOILER, MEANS ON ONE OF SAID DOORS SEALINGLY ENGAGING SAID TUBE SHEET IN THE AREA SURROUNDING SAID COMBUSTION TUBE AND SAID FIRST GROUP OF FIRES TUBES, AND SAID ONE OF SAID DOORS BEING RECESSED TO FORM A SEALED GAS REVERSAL CHAMBER CONNECTING THE END OF SAID COMBUSTION TUBE AND SAID FIRST GROUP OF FIRE TUBES, AND THE OTHER DOOR FORMING A SEALED CHAMBER CONNECTING SAID SECOND GROUPS OF FIRE TUBES TO AN EXHAUST STACK, ONE OF SAID DOORS EXTENDING ACROSS A PORTION OF THE REAR OF SAID BOILER AND THE OTHER DOOR EXTENDING ACROSS THE REMAINDER OF THE REAR OF SAID BOILER WHEREBY SAID DOORS CAN BE OPENED INDEPENDENTLY.