Air heating burners

Claim 1

A GAS MIXING BURNER ADAPTED FOR OPERATION IN AN AIR STREAM FLOWING FORWARDLY PAST THE BURNER, SAID BURNER COMPRISING A TUBULAR BURNER BODY HAVING A FORWARD BURNER FACE DIRECTED DOWNSTREAM AND PROVIDED WITH A MULTIPLICITY OF SPACED RELATIVELY SMALL BURNER PORTS THEREIN A COMMUNICATION WITH THE INTERIOR OF THE BODY FOR PRODUCING A CORRESPONDING NUMBER OF FORWARDLY DIRECTED FLAME JETS, FLAMECONFINING WALLS EXTENDING FORWARDLY FROM SAID FORWARD BURNER FACE AND, IN COMBINATION WITH SAID BURNER FACE, DEFINING A FORWARDLY OPENING COMBUSTION TROUGH, MEANS INCLUDING SAID FLAME-CONFINING WALLS DEFINING A PAIR OF CLOSED AIR SUPPLY CHAMBERS ON OPPOSITE SIDES OF THE COMBUSTION TROUGH, SAID FLAME-CONFINING WALLS BEING FORMED WITH A PLURALITY OF OPENINGS SPACED BOTH LONGITUDINALLY AND AT DIFFERENT DISTANCES FROM SAID BURNER FACE, MEANS FOR SUPPLYING LOW PRESSURE AIR THE THE INTERIORS OF SAID AIR SUPPLY CHAMBERS, AND MEANS FOR INTEGRALLY SUPPLYING FUEL GAS UNDER PRESSURE TO THE INTERIOR OF SAID TUBULAR BURNER BODY.