Apparatus for the scale free heating of metals

Claim 1

A FURNACE FOR THE SCALE-FREE HEATING OF METAL COMPRISING A WORK HEATING CHAMBER, A PLURALITY OF PRIMARY COMBUSTION CHAMBER DISPOSED ABOUT THE PERIPHERY OF SAID WORK HEATING CHAMBER, MEANS FOR SUPPLYING FUEL AND PRIMARY AIR TO SAID PRIMARY COMBUSTION CHAMBERS, THE RATES TO AIR TO FUEL BEING SUBSTANTIALLY LESS THAN THAT REQUIRED FOR COMPLETE COMBUSTION, PORTS EXTENDING DIRECTLY FROM SAID PRIMARY COMBUSTION CHAMBER INTO SAID WORK HEATING CHAMBER AND DISTRIBUTED SUBSTANTIALLY UNIFORMLY ABOUT SAID PERIPHERY WHEREBY SAID PRIMARY COMBUSTION PRODUCTS WILL PASS INTO AND FORM A GASEOUS ATMOSPHERE IN SAID WORK HEATING CHAMBER, A PLURALITY OF SECONDARY COMBUSTION CHAMBERS DISPOSED BENEATH SAID WORK HEATING CHAMBER AND SEPARATED THEREFROM BY REFRACTORY WALLS COMPOSED OF A MATERIAL HAVING RELATIVELY GOOD HEAT CONDUCTIVITY, MEANS FOR VENTING THE ATMOSPHERE FROM SAID WORK HEATING CHAMBER TO SAID SECONDARY COMBUSTION CHAMBERS, MEANS FOR SUPPLYING SUPPLEMENTAL AIR TO SECONDARY COMBUSTION CHAMBERS IN AN AMOUNT TO SUPPORT SECONDARY COMBUSTION OF SAID VENTED ATMOSPHERE, MEANS FOR EXHAUSTING SAID SECNDARY COMBUSTION PRODUCTS FROM SAID SECONDARY COMBUSTION CHAMBERS, AND MEANS FOR PASSING AND PRIMARY AND SUPPLEMENTAL AIR IN HEAT TRANSFER RELATION TO SAID EXHAUSTED SECONDARY COMBUSTION PRODUCTS.