Slag tap furnace

Claim 1

A SLAG TAP FURNACE, COMPRISING FRONT, REAR, AND SIDE WALLS DEFINING A VERTICALLY-ELONGATED COMBUSTION CHAMBER, A REFRACTORY BOTTOM UNDERLYING THE CHAMBER, A TAP HOLE LOCATED IN THE BOTTOM, SUBSTANTIAL ABUTMENTS EXTENDING TOWARD ONE ANOTHER FROM OPPOSED WALLS TO DEFINE WITH THE BOTTOM A HIGH-TEMPERATURE CELL, BURNERS LOCATED ON THE UNDER SURFACES OF THE ABUTMENTS, EACH BURNER HAVING A FUEL GUN WITH A RECTANGULAR TUBULAR HOUSING AND AN ELEMENT EXTENDING LONGITUDINALLY OF THE HOUSING, THE ELEMENT BEING ROTATABLE ABOUT A LONGITUDINAL AXIS AND BEING LONGITUDINALLY SLIDABLE, EACH ELEMENT HAVING A SERIES OF DIRECTING MEMBERS ADAPTED TO EXTEND A SUBSTANTIAL ANGLE TO THE LONGITUDINAL AXIS AND ARRANGED IN A GENERALLY RECTANGULAR PATTERN TO FIT IN THE RECTANGULAR TUBULAR HOUSING OF THE GUN, AND MEANS FOR MOVING THE ELEMENT LONGITUDINALLY IN ONE DIRECTION TO FREE THE DIRECTING MEMBERS OF THE RECTANGULAR TUBULAR HOUSING OF THE GUN, FOR ROTATING THE ELEMENT ALTERNATELY TO DIRECT THE MEMBERS DOWNWARDLY TOWARD THE TAP HOLE OR UPWARDLY AWAY FROM THE TAP HOLE AND FOR MOVING THE ELEMENT LONGITUDINALLY IN THE OTHER DIRECTION TO RETURN THE DIRECTING MEMBERS TO THE HOUSING OF THE GUN.