Furnace roof

Claim 1

A FURNACE ROOF STRUCTURE COMPRISING: (1) A PLURALITY OF REFRACTORY ARCHES FORMED OF INDIVIDUAL BLOCKS OF REFRACTORY MATERIAL, EACH OF THE BLOCKS HAVING THE CORNERS TO BE LAID AS THE OUTER SURFACE OF THE ROOF CUT AWAY WHEREBY THE PLACING OF BLOCKS IN PARALLEL AND END-TO-END RELATIONSHIP FORMS A PLURALITY OF CHANNELS IN THE OUTER SURFACE OF THE ROOF; (2) COOLANT CONDUIT MEANS ARRANGED FOR CIRCULATION OF COOLANT THERETHROUGH PLACED WITHIN THE CHANNELS, THE CONDUIT MEANS EXTENDED FROM THE LOWER ENDS OF THE ARCHES TO THE UPPER ENDS THEREOF, MEANS SUPPLYING COOLANT TO THE LOWER END OF THE CONDUIT MEANS, THE UPPER ENDS OF THE CONDUIT MEANS HAVE AN OPEN DISCHARGE MEANS WHEREBY FLOW OF COOLANT THROUGH THE CONDUIT MAY BE VISUALLY OBSERVED; AND (3) HEAT RECEIVING SURFACES IN HEAT EXCHANGE RELATIONSHIP TO THE CONDUIT MEANS AND EXTENDING THEREFROM WITHIN THE CHANNELS WHEREBY HEAT IS ABSORBED FROM SAID REFRACTORY ARCHES INTO SAID COOLANT.