Filtering mechanism

Claim 1

A FILTER ASSEMBLY COMPRISING AN ANNULAR WALL, A FIRST HEAD AND A SECOND HEAD SECURED TO THE OPPOSITE ENDS OF SAID WALL TO DEFINE THEREWITH A CHAMBER, SAID WALL BEING FORMED WITH AN EQUIANGULARLY-SPACED SERIES OF PORTS THERETHROUGH, A PLURALITY OF HOLLOW FILTER UNITS, ONE FOR EACH PORT, ARRANGED IN A RADIATING SERIES EXTERNALLY OF SAID WALL WITH THEIR PROXIMAL ENDS ARRANGED FOR COMMUNICATION WITH SAID PORTS, RESPECTIVELY, EACH OF SAID HEADS BEING FORMED WITH A PORT THERETHROUGH, AXIALLY-EXTENDING PARTITION MEANS ARRANGED IN SAID CHAMBER AND COOPERATING WITH SAID WALL TO DIVIDE SAID CHAMBER INTO SEPARATE SECTIONS, ONE SECTION BEING OPEN TO A PLURALITY OF SAID PORTS AND TO ONE ONLY OF SAID HEAD PORTS AND THE OTHER SECTION BEING OPEN TO A LARGER NUMBER OF SAID PORTS AND TO THE OTHER ONLY OF SAID HEAD PORTS, AND MEANS FOR EFFECTING RELATIVE ROTATIONAL MOVEMENT, ABOUT THE AXIS OF SAID ANNULAR WALL, BETWEEN SAID PARTITION MEANS AND SAID FILTER UNITS TO BRING SUCCESSIVE ONES OF SAID UNITS PROGRESSIVELY OUT OF COMMUNICATION WITH SAID ONE HEAD PORT AND INTO COMMUNICATION WITH SAID OTHER HEAD PORT AND VICE VERSA.