Apparatus for scale free heating of metals

Claim 1

STRUCTURE FOR HEATING MATERIAL IN A NON-OXIDIZING ATMOSPHERE COMPRISING A FURNACE ENCLOSURE, A POROUS HEARTH EXTENDING TRANSVERSELY OF THE ENCLOSURE DIVIDING THE ENCLOSURE INTO A LOWER PRIMARY COMBUSTION CHAMBER AND AN UPPER SECONDARY COMBISTION CHAMBER, MEANS FOR METERING FUEL AND BETWEEN FORTY AND SIXTY PERCENT OF THE OXYGEN NECESSARY TO COMPLETELY BURN THE FUEL INTO THE PRIMARY COMBUSTION CHAMBER FOR IGNITION IN THE PRIMARY COMBUSTION CHAMBER TO HEAT MATERIAL PLACED ON THE POROUS HEARTH, MEANS FOR DRAWING THE COMBUSTION GASES OF THE FIRST BURNING OF THE FUEL THROUGH THE POROUS HEARTH OVER THE MATERIAL TO BE HEATED AND INTO THE SECONDARY COMBUSTION CHAMBER AND MEANS FOR INTRODUCING SUFFICIENT OXY GEN INTO THE SECONDARY COMBUSTION CHAMBER AT A LOCATION ADJACENT TO BUT ABOVE THE MATERIAL TO BE HEATED TO COMPLETE THE COMBUSTION OF THE FUEL IN THE COMBUSTION GASES FROM THE FIRST BURNING OF THE FUEL IN THE PRIMARY COMBUSTION CHAMBER IN THE SECONDARY COMBUSTION CHAMBER AND TO HEAT THE MATERIAL BY RADIATION.