Nozzle mixing type gas burner

Claim 1

BURNER APPARATUS COMPRISING, IN COMBINATION: FIRST WALL MEANS FORMING A PASSAGE HAVING AN INLET ADAPTED TO RECEIVE A STREAM OF AIR AND AN OUTLET LONGITUDINALLY SPACD FROM THE INLET; SECOND WALL MEANS DISPOSED INTERIORLY OF THE FIRST WALL MEANS AND SPACED THEREFROM AND FORMING AN ANNULAR CHAMBER WHOSE AXIS IS SUBSTANTIALLY PARALLEL TO THE AXIS OF THE LONGITUDINAL PASSAGE AND WHICH IS SHAPED AS A PAIR OF SPACED APART U-SHAPED PORTIONS IN AXIAL CROSSSECTION WITH THE BIGHT OF EACH U-SHAPED PORTION EXTENDING TOWARD THE INLET OF THE PASSAGE, AND EACH U-SHAPED PORTION BEING SUBSTANTIALLY UNOBSTRUCTED TO FLOW AS IT EXTENDS AWAY FROM THE BIGHT TOWARD THE OUTLET OF THE PASSAGE; ANNULAR FUEL SUPPLY MEANS DISPOSED WITHIN THE PASSAGE EXTERIORLY OF THE ANNULAR CHAMBER AND ADJACENT AND SUBSTANTIALLY CONCENTRICALLY THERETO AND COMPRISING FIRST PORT MEANS FOR DELIVERING A FIRST PORTION OF A FUEL SUPPLY TO THE PASSAGE EXTERIORLY OF THE ANNULAR CHAMBER IN AN ANNULAR PATTERN WITH A DIRECTION OF FLOW TOWARD THE OUTLET OF THE PASSAGE, AND FURTHER COMPRISING SECOND PORT MEANS FOR DELIVERING A SECOND PORTION OF THE FUEL SUPPLY IN AN ANNULAR PATTERN TO THE INTERIOR OF THE ANNULAR CHAMBER; AND THIRD PORT MEANS FOR ADMITTING A PORTION OF THE AIR STREAM FLOWING THROUGH THE PASSAGE TO THE INTERIOR OF THE ANNULAR CHAMBER IN AN ANNULAR PATTERN TO FORM A COMBUSTIBLE MIXTURE OF AIR AND FUEL WITH THE SECOND PORTION OF THE FUEL SUPPLY, THE ANNULAR CHAMBER BEING OF SUCH AN EXTENT THAT, WHEN THE COMBUSTIBLE MIXTURE IS IGNITED, IT WILL BURN WITH STABILITY THEREIN AND FLAME WILL EXTEND THEREFROM TO IGNITE AND STABLIZE THE SUBSEQUENT COMBUSTIBLE REACTION BETWEEN THE FIRST PORTION OF THE FUEL SUPPLY AND AIR FROM THE REMAINING PORTION OF THE AIR STREAM.