Light weight fractionating tray

Claim 1

IN COMBINATION WITH A TOWER, A FRACTIONATING TRAY COMPRISING A PLURALITY OF TROUGHS SPACED AT UNIFORM INTERVALS TRANSVERSELY ACROSS THE TOWER AND ARRANGED IN COPLANAR RELATIONSHIP ONE WITH THE OTHER, A PLURALITY OF L-SHAPED SECTIONS HAVING THE HORIZONTAL LEGS THEREOF ATTACHED TO THE DOWNSTREAM EDGES OF EACH OF THE AFOREMENTIONED TROUGHS, THE VERTICAL LEGS OF SAID SECTIONS BEING SERRATED AND POINTING DOWNWARD AND OVERHANGING INTO ADJACENT TROUGHS, THEREBY AFFORDING PASSAGES FOR THE UPWARD FLOW OF VAPOR THERETHROUGH, A PLURALITY OF END CLOSURE PLATES PERPENDICULARLY AFFIXED TO EITHER END OF THE TROUGHS AND OVERHANGING SECTIONS, A PLURALITY OF STIFFENING WEBS EXTENDING ACROSS THE TROUGHS IN A RIGHT ANGLE DIRECTION THERETO, EACH OF SAID END CLOSURE PLATES OVERLAPPING ONE ANOTHER AND HAVING A RECESSED SLOT EXTENDING VERTICALLY FROM THE LOWER EDGE THEREOF AT A POINT CORRESPONDING TO THE JUNCTURE OF THE UPSTREAM WALL OF THE ADJACENT DOWNSTREAM TROUGH AND THE END CLOSURE PLATE AFFIXED TO SAID ADJACENT TROUGH, THE SLOTTED EDGE IN EACH OF SAID PLATES ENGAGING THE UPSTREAM WALL OF THE ADJACENT DOWNSTREAM TROUGH, SAID STIFFENING WEBS BEING SLOTTED AND THE SLOTS THEREIN ENGAGING THE SERRATED EDGES OF SAID OVERHANDING VERTICAL LEGS TO AFFORD A RIGID COMBINATION OF STIFFENED INTERLOCKING TROUGHS.