Tunnel kiln car top

Claim 1

A TUNNEL KILN CAR TOP COMPRISING A PLURALITY OF INTERLOCKING TILES DISPOSED IN PARALLEL ROWS, ALL SAID TILES FABRICATED OF THE SAME REFRACTORY MATERIAL, SAID TILES INCLUDING THREE DIFFERENT SHAPES, THE FIRST SHAPE BEING LIKE A HORIZONTAL T HAVING A STEM AND A CROSS BAR, THE SECOND SHAPE BEING LIKE TWO OF SAID FIRST SHAPE JOINED STEM TO STEM TO LOCATE THE CROSS BARS AT OPPOSITE ENDS OF THE TILE, THE LAST SHAPE BEING LIKE THE SECOND SHAPE BUT WITH THE ENDS OF BOTH CROSS BARS OMITTED AT ONE SIDE OF THE STEM, THE STEM SIDE OF EACH END OF THE CROSS BARS FORMING AN ACUTE ANGLE WITH THE ADJOINING STEM, THE TILES IN EACH ROW BEING ARRANGED BAR TO BAR WITH THEIR STEMS IN ALIGNMENT, TILES OF SAID LAST SHAPE BEING IN THE TWO OUTER ROWS, TILES OF SAID FIRST AND SECOND SHAPES BEING IN ONLY THE INTERMEDIATE ROWS WITH SAID FIRST SHAPE ONLY AT ROW ENDS, AND THE SPACE BETWEEN THE CROSS BARS OF EACH TILE FO THE SECOND AND LAST SHAPES FORMING AT THE SIDE OF THE TILE A DOVETAIL NOTCH RECEIVING AND RETAINING THE ENDS OF A PAIR OF CROSS BARS OF TWO TILES IN AN ADJOINING ROW, SAID DOVETAIL NOTCH BEING WIDER THAN A SAID PAIR OF CROSS BARS, WHEREBY THE TILES ARE INTERLOCKED IN TWO DIRECTIONS HORIZONTALLY AT RIGHT ANGLES TO EACH OTHER, THE BOTTOM OF EACH TILE BEING PROVIDED CENTRALLY OF ITS STEM WITH A DOWNWARDLY OPENING RECESS EXTENDING THROUGHOUT THE LENGTH OF THE TILE, ALL OF SAID RECESSES IN EACH ROW BEING IN ALIGNMENT WITH ONE ANOTHER AND IN OPEN COMMUNICATION WITH SOME OF THE JOINTS BETWEEN TILES.