1. IN A FUEL OIL GASIFICATION BURNER, COMPRISING A HIGH PRESSURE NOZZLE THROUGH WHICH OIL IS INJECTED THROUGH A VENTURI-SHAPED INTAKE OPENING FLARING INTO A MIXING AND GASIFYING CHAMBER SO AS TO FORM A SPRAY CONE, AND A BLOWER BLOWING AIR INTO THE NARROWEST PORTION OF THE CHAMBER, THE AIR MAKIG A ROTATING MOVEMENT, THE OIL BEING VAPORIZED IN THE CHAMBER TO FORM A COMBUSTIBLE MIXTURE WITH THE AIR WHICH MIXTURE IS THEN CONVEYED TO A COMBUSTION ZONE AND BURNED PRODUCING A FLAME AND WHEREIN HOT WASTE GAS IS EXHAUSTED FROM THE PERIPHERY OF THE FLAME AND MIXED WITH SAID AIR, THE IMPROVEMENT COMPRISING, PASSAGEWAY MEANS TO SUPPLY THE HOT WASTE GAS TO THE INTAKE SIDE OF THE BLOWER, SAID MIXING CHAMBER FLARING WITH A CONE ANGLE LARGER THAN THE ANGLE OF THE SPRAY CONE OF THE FUEL OIL AND BEING SO DIMENSIONED AND POSITIONED THAT A SHELL OF ROTATING AIR IS GUIDED ALONG THE WALLS OF THE MIXING CHAMBER WITHOUT CHANGING FROM LAMINAR TO TURBULENT FLOW.