Plate tower

Claim 1

IN A TOWER OF THE TYPE DESCRIBED, IN COMBINATION: (A) A SHELL DEFINING A VERTICALLY EXTENDING CAVITY; (B) A PLURALITY OF FLUID-IMPERVIOUS, VERTICALLY SPACED, HORIZONTALLY EXTENDING WALLS IN SAID CAVITY; (1) SAID WALLS DEFINING THEREBETWEEN A PLURALITY OF SUPERPOSED COMPARTMENTS IN SAID CAVITY; (C) A PLATE HORIZONTALLY EXTENDING IN EACH COMPARTMENT, (1) SAID PLATE HAVING A FORAMINOUS PORTION VERTICALLY SPACED FROM THE WALLS DEFINING SAID COMPARTMENT, (2) SAID PLATE DIVIDING SAID COMPARTMENT INTO AN UPPER PORTION AND A LOWER PORTION, (3) SAID COMPARTMENTS INCLUDING A FIRST AND A SECOND COMPARTMENT, SAID SECOND COMPARTMENT BEING SUPERPOSED ON SAID FIRST COMPARTMENT; (D) FIRST OVERFLOW MEANS CONNECTING THE LOWER PORTION OF SAID SECOND COMPARTMENT WITH THE UPPER PORTION OF SAID FIRST COMPARTMENT WITH THE UPPER PORTION FLOW LEVEL IN SAID LOWER PORTION, (1) SAID FIRST OVERFLOW MEANS INCLUDING A FIRST CONDUIT HAVING TWO ORIFICES RESPECTIVELY DIRECTLY COMMUNICATING WITH SAID LOWER PORTION OF SAID SECOND COMPARTMENT AND SAID UPPER PORTION OF SAID FIRST COMPARTMENT: AND (E) SECOND OVERFLOW MEANS CONNECTING THE UPPER PORTION OF SAID SECOND COMPARTMENT WITH THE UPPER PORTION OF SAID FIRST COMPARTMENT AND DEFINING A SECOND OVERFLOW LEVEL IN SAID UPPER PORTION OF SAID SECOND COMPARTMENT, (1) SAID SECOND OVERFLOW LEVEL BEING HIGHER THAN SAID FORAMINOUS PORTION AND LOWER THAN SAID FIRST OVERFLOW, LEVEL, AND (2) SAID SECOND OVERFLOW MEANS INCLUDING A SECOND CONDUIT HAVING TWO ORIFICES RESPECTIVELY DIRECTLY COMMUNICATING WITH SAID UPPER PORTION OF SAID SECOND COMPARTMENT AND SAID UPPER PORTION OF SAID FIRST COMPARTMENT.