Double fired heating boiler

Claim 1

A DOUBLE-FIRED BOILER COMPRISING A COMBUSTION CHAMBER FOR FLUID FUEL, A FURNACE FOR SOLID FUEL DISPOSED ALONGSIDE AND EXTENDING ABOVE SAID COMBUSTION CHAMBER, A DIRECTLY HEATED COMMON WATER PILOT ENCLOSING SAID COMBUSTION CHAMBER AND SAID FURNAC,E SAID FURNACE HAVING OPPOSITELY POSITIONAL VERTICALLY DISPOSED LATERAL WALLS AND A VERTICALLY DISPOSED TRANSVERSE WALL EXTENDING BETWEEN SAID LATERIAL WALLS AT ONE END THEREOF, SAID COMBUSTION CHAMBER HAVING OPPOSITELY POSITIONED VERTICALLY DISPOSED LATERIAL WALLS AND A VERTICALLY DISPOSED U-SHAPED TRANSVERSE WALL ARRANGED BETWEEN SAID LATERLA WALS OF THE COMBUSTION CHAMBER AND COOPERATING THEREWITH TO FORM TWO VERTICALLY EXTENDING OUTLET PASSAGES FOR RESPECTIVELY DISCHARGING FLUE GAS FROM SAID COMBUSTION CHAMBER TWO THE LOWER POSITION OF SAID FURNACE ALONG SAID LATERAL WALLS OF THE FURNACE, AND SAID TRANSVERSE WALL OF THE FURNACE AND SAID U-SHAPED TRANSVERSE WALL OF TEH COMBUSTION CHAMBER COOPERATING WITH EACH OTHER TO PROVIDE THEREBETWEEN A VERTICALLY EXTENDING WATER COMPARTMENT COMMUNICATING AT ITS UPPER END WITH THE UPPER PORTION OF THE WATER JACKET AND ITS LOWER END WITH THE LOWER PORTION OF THE WATER JACKET, AND AN INDIRECTLY HEATED WATER HEATER EXTENDING VERTICALLY IN SAID WATER COMPARTMENT.