Steam producer with radiation flue

Claim 1

IN A STEAM PRODUCER, A VERTICAL FIRE-BOX, ROWS OF BURNERS DISPOSED ALONG OPPOSITE WALLS SO THAT FLUE GASES IN THE CENTRAL SPACE HAVE HIGHER TEMPERATURES THAN THOSE AT THE SIDES OF THE FIRE-BOX, VERTICAL FLUE MEANS OF THE SAME SUBSTANTIALLY UNIFORM CROSS SECTION EXTENDING VERTICALLY UPWARDLY FROM SAID FIRE-BOX, INCLUDING A FIRST RADIATION SECTION HAVING A CLEAR CENTRAL SPACE SURROUNDED BY RADIATION ABSORBING SURFACES TO EXTRACT HEAT BY RADIATION, AND A SECOND SECTION ABOVE SAID FIRST SECTION THROUGH WHICH THE FLUE GASES PASS FROM SAID FIRST SECTION, CONTACT HEATING SURFACES DISPOSED IN SAID SECOND SECTION TO EXTRACT HEAT FROM SAID GASES BY CONTACT, AND MEANS TO DISTRIBUTE THE GASES OF UNEQUAL TEMPERATURES EQUALLY THROUGH SAID SECOND SECTION COMPRISING A DISPLACEMENT BODY OF SUBSTANTIAL LATERAL EXTENT SUSPENDED PARALLEL TO SAID OPPOSITE WALLS AND EXTENDING SUBSTANTIALLY ACROSS THE TOP CENTRALLY OF THE FIRST SECTION IMMEDIATELY BELOW THE CONTACT HEATING SURFACES TO DEFLECT THE HOT GASES OF THE CENTRAL SPACE TOWARD THE SIDES OF THE FLUE MEANS TO MIX WITH THE COOLER GASES ALONG THE SIDES.