Refractory brick and furnace construction

Claim 1

IN A FURNACE ROOF CONSTRUCTION, A PLURALITY OF REFRACTORY BRICK UNITS, EACH OF SAID UNITS INCLUDING A PAIR OF OPPOSITE LONGITUDINAL FACES FACING LONGITUDINALLY OF THE ROOF ROOF, EACH OF SAID UNITS INCLUDING A HOT END FACE ADAPTED TO BE POSITIONED IN FACING RELATIONSHIP TO THE INTERIOR OF A FURNACE AND A COLD END FACE REMOTE FROM SAID HOT END FACE, THE LATERAL FACES OF ADJACENT UNITS BEING IN SIDE-BYSIDE RELATIONSHIP AND THE LONGITUDINAL FACES OF ADJACENT UNITS BEING IN SIDE-BY-SIDE RELATIONSHIP, EACH OF THE FACES HAVING A METALLIC PLATE FIXEDLY ATTACHED THERETO, EACH OF SAID PLATES BEING SPACED FROM THE HOT END ARRIS AND THE LONGITUDINALLY EXTENDING ARRISES OF THE ASSOCIATED FACE SUCH THAT WHEN THE UNITS ARE DISPOSED ADJACENT TO ONE ANOTHER, TUNNELS ARE DEFINED BETWEEN THE ADJACENT LONGITUDINALLY EXTENDING ARRISES FOR TRANSMITTING HEAT LONGITUDINALLY OF THE BODIES, THE PLATE SECURED TO ONE LATERAL FACE OF EACH UNIT HAVING INTEGRAL HOLLOW AND COMPRESSIBLE SPACER MEANS FORMED THEREIN ADJACENT THE HOT END ARRIS OF THE LATERAL FACE, SAID SPACER MEANS EXTENDING ONLY A MINOR PORTION OF THE LENGTH OF THE PLATE, THE REMAINING MAJOR PORTION OF THE LENGTH OF THE ASSOCIATED PLATE LYING SUBSTANTIALLY IN A PLANE, THE PLATE FIXED TO THE OPPOSITE LATERAL FACE OF EACH UNIT BEING FLAT, SAID UNITS BEING ASSEMBLED SUCH THAT THE SPACER MEANS FORMED ON THE PLATE OF THE LATERAL FACE OF ONE UNIT ABUTS AGAINST THE FLAT PLATE SECURED TO THE LATERAL FACE OF THE ADJACENT UNIT.