Coal fired furnace

Claim 1

IN COMBINATION WITH A BOILER HAVING A COAL FEED OPENING AND A FUEL COMBUSTION SPACE THEREBEYOND DEFINED LATERALLY BY VERTICAL WATER WALLS DEFINING A WATER SPACE ON ONE SIDE, A GRATE COMPRISING TWO HORIZONTALLY SPACED HEADER TUBES IN SAID COMBUSTION SPACE INTERCONNECTING AND EXTENDING AT THEIR OPPOSITE ENDS THROUGH SAID WATER WALLS IN SEALED RELATIONSHIP THEREWITH AND IN OPEN COMMUNICATION WITH SAID WATER SPACE THEREIN, THE HEADER TUBE ADJACENT TO THE FEED OPENING BEING DISPOSED BELOW THE LEVEL OF THE FEED OPENING AND THE HEADER TUBE REMOTE FROM THE FEED OPENING BEING DISPOSED BELOW THE LEVEL OF THE FIRST MENTIONED HEADER TUBE, A PLURALITY OF COPLANAR WATER PIPES INTERCONNECTING SAID HEADER TUBES SPACED FROM EACH OTHER IN A DIRECTION LENGTHWISE OF SAID HEADERS AND AT THEIR ENDS IN OPEN COMMUNICATION THEREWITH, PLURAL ROWS OF END ABUTTING TUYERES HAVING LEGS DISPOSED BETWEEN EACH PAIR OF SAID PIPES AND ABUTTING THE EDGES OF ADJACENT ROWS OF TUYERES ABOVE THE CENTER OF SAID PIPES, SAID LEGS TERMINATING DOWNWARDLY AT A PLANAR LEVEL ABOVE THE PLANE OF THE LOWEST SIDES OF SAID PIPES, TRANSVERSE TIE BARS ENGAGING THE LOWEST SIDES OF SAID PIPES, METAL CLAMPING MEANS FLUSH WITH THE TOP OF THE TUYERES EXTENDING THROUGH SAID LEGS AND TIE BARS FOR CLAMPING SAID TUYERES AGAINST SAID PIPES, HIGH HEAT CONDUCTIVE MEANS INTIMATELY INTERCONNECTING THE INTERFACES OF SAID TUYERES AND PIPES AND SAID TUYERES AND CLAMPING MEANS.