Combustion system for soaking pits

Claim 1

IN SOAKING PIT APPARATUS HAVING WALL MEANS DEFIN-ING A PLURALITY OF COMBUSTION AND HEATING CHAMBERS, A BURNER ASSOCIATED WITH EACH CHAMBER FOR DELIVERING HEATING FLAME THERETO, AN EXHAUST, PASSAGEWAY IN FLUID COMMUNICATION WITH ALL OF THE CHAMBERS FOR EXHAUSTING COM-BUSTION PRODUCTS FROM EACH CHAMBER, RECUPERATOR MEANS DISPOSED IN THE EXHAUST PASSAGEWAY AND HAVING AN AIR PASSAGEWAY IN INDIRECT HEAT TRANSFER RELATIONSHIP WITH THE FLOW OF COMBUSTION PRODUCTS THROUGH THE RECUPERATOR, JET JUMP MEANS FOR DRAWING HEATED AIR THROUGH THE RECUPERA-TOR AND DELIVERING HEATED TO EACH BURNER, SAID JET PUMP MEANS COMPRISING, IN COMBINATION: A MANIFOLD; A VENTURITUBE HAVING A DIFFUSER PORTION IN FLUID COMMUNICATION WITH THE MANIFOLD AND AN INLET PORTION IN FLUID COMMUNICATION WITH THE OUTLET OF THE AIR PASSAGEWAY OF THE RECUPERATOR; A COMBUSTOR ADAPTED TO PROMOTE THE COMBUSTIBLE REACTION OF FUEL AND AIR TO PRODUCE A STREAM OF PRODUCTS OF COMBUSTION AN DISPOSED ADJACENT TO AND DIRECTED TOWARD THE INLET PORTION OF THE VENTURI TUBE FOR INTRODUCING PRODUCTS OF COMBUSTION FROM THE COMBUSTOR INTO THE VENTURI TUBE IN INSPIRATING RELATIONSHIP WIHT HEATED AIR FROM THE RECUPERATOR; PIPE MEANS FOR DELIVERING FUEL AND AIR TO THE COMBUSTOR; CONTROL MEANS RESPONSIVE TO FLUID PRESSURE WITHIN THE MANIFOLD FOR CONTROLLING THE RATES OF FLOW OF FUEL AND AIR TO THE COMBUSTOR AT A FIXED RATIO TO EACH OTHE IN A MANNER TO MAINTAIN FLUID PRESSURE IN THE MANIFLOD SUBSTANTIALLY CONSTAN; A FIRST CONDUIT ASSOCIATED WITH EACH CHAMBER FOR DELIVERING FLUID FROM THE MANIFOLD TO THE BURNER; A SECOND CONDUIT ASSOCIATED WITH EACH CHAMBER