Steam boiler and hot water generator

Claim 1

IN A WATER TUBE BOILER HAVING UPPER AND LOWER ELONGATED PARALLEL HEADER MEANS, LATERALLY ADJACENT WATER TUBES CONNECTING THE UPPER AND LOWER HEADER MEANS AND ARRANGED TO FORM THE BOILER ENCLOSURE, SAID ENCLOSURE HAVING INLET MEANS THROUGH WHICH FUEL FOR COMBUSTION MAY ENTER THE ENCLOSURE, AND OUTLET MEANS FOR SPENT GASES, AND OTHER WATER TUBES INSIDE SAID ENCLOSURE CONNECTING THE UPPER AND LOWER HEADER MEANS AND ARRANGED TO FORM A PARTITION WHICH DIVIDES THE INTERIOR OF THE ENCLOSURE INTO A COMBUSTION CHAMBER TO WHICH THE INLET MEANS LEADS AND A CONVECTION CHAMBER FROM THE UPEPR PORTION OF WHICH THE OUTLET MEANS LEADS, SAID PARTITION BEING FORMED WITH PASSAGE MEANS IN THE BOTTOM PORTION THEREOF THROUGH WHICH THE TWO CHAMBERS ARE COMMUNICATED SO THAT COMBUSTION GASES ENTERING THE CONVECTION CHAMBER FROM THE COAMBUSTION CHAMBER FLOW UPWARDLY IN THE CONVECTION CHAMBER, THE IMPROVEMENT WHICH COMPRISES: A BANK OF WATER TUBES WITH EXTENDED SURFACE THEREON ALSO CONNECTED WITH BOTH HEADER MEANS AND UNIFORMLY DISTRIBUTED IN THE CONVECTION CHAMBER ABOVE SAID PASSAGE MEANS IN THE PARTITION TO PROVIDE CONVECTION SURFACE FOR THE BOILER, ALL OF THE TUBES IN SAID BANK BEING VERTICAL SO AS TO BE PARALLEL TO THE FLOW OF GASES THROUGH THE CONVECTION CHAMBER, AND THE EXTENDED SURFACE ON SAID TUBES CONSISTING OF A MULTIPLICITY OF INDIVIDUAL ELEMENTS OF METAL HAVING RELATIVELY GOOD HEAT CONDUCTIVITY, SECURED TO AND PROJECTING SUBSTANTIALLY PERPENDICULARLY FROM THE TUBES SO AS TO BE TRANSVERSE TO THE GAS FLOW IN THE CONVECTION CHAMBER.