Furnace with burner means

Claim 1

MEANS FOR HEATING A FURNACE HAVING A HEATING CHAMBER DEFINED BY A REFRACTORY WALL COMPRISING A PLURALITY OF BURNER MEANS MOUNTED ON SAID REFRACTORY WALL TO DIRECT A HEATING GAS STREAM INTO THE HEATING CHAMBER OF THE FURNACE, EACH OF SAID BURNER MEANS HAVING AN INLET CHAMBER, MEANS DEFINING AN ANNULAR BURNER ORIFICE INCLUDING A WALL DEFINING THE PERIPHERY OF SAID BURNER ORIFICE AND A PLUG MEMBER COOPERABLE WITH SAID WALL AND MOVABLE BETWEEN A HIGH FIRE POSITION AND A LOW FIRE POSITION TO PROVIDE A LARGE BURNER ORIFICE AND A RELATIVELY SMALL BURNER ORIFICE, RESPECTIVELY, MEANS FOR DELIVERING FUEL TO SAID INLET CHAMBER AT VARIOUS RATES IN ACCORDANCE WITH THE HEAT DEMAND OF SAID FURNACE, MEANS CONNECTED TO SAID PLUG MEMBER FOR ACTUATING THE SAME BETWEEN SAID POSITIONS THEREOF, AND MEANS RESPONSIVE TO THE FUEL PRESSURE IN SAID INLET CHAMBER FOR CONTROLLING MOVEMENT OF SAID PLUG ACTUATING MEANS BETWEEN A PAIR OF POSITIONS WHEREBY SAID PLUG MEMBER IS MOVED BETWEEN SAID HIGH FIRE AND LOW FIRE POSITIONS THEREOF.