Marine type muffler

Claim 1

A MARINE TYPE MUFFLER COMPRISING AN ELONGATED TUBULAR HOUSING, SEPARATE INNER AND OUTER END HEADERS RESPECTIVELY CLOSING THE OPPOSITE ENDS OF SAID HOUSING, A PAIR OF TRANSVERSELY EXTENDING PARTITIONS SECURED WITHIN SAID HOUSING IN LONGITUDINALLY SPACED RELATION TO SAID END HEADERS AND TO EACH OTHER DIVIDING SAID HOUSING INTO FIRST AND SECOND RESONANT CHAMBERS RESPECTIVELY ADJACENT SAID INNER AND OUTER END HEADERS AND A THIRD RESONANT CHAMBER BETWEEN SAID FIRST AND SECOND CHAMBERS, AN INLET TUBE EXTENDING THROUGH SAID INNER END HEADER INTO SAID FIRST CHAMBER, AN ACOUSTICAL COUPLING DUCT EXTENDING THROUGH AND SECURED TO ONE OF SAID PARTITIONS, A SECOND ACOUSTICAL DUCT EXTENDING THROUGH AND SECURED TO THE OTHER OF SAID PARTIONS, SAID DUCTS PLACING SAID CHAMBERS IN COMMUNICATION WITH ONE ANOTHER, SAID INLET TUBE AND SAID DUCTS BEING IN SPACED AXIAL ALIGNMENT WITH ONE ANOTHER AND DISPOSED ADJACENT TO THE SIDE WALL OF SAID TUBULAR HOUSING IN LATERALLY OFFSET PARALLEL RELATION TO THE LONGITUDINAL CENTER LINE OF SAID HOUSING, THE END OF SAID INLET TUBE WITHIN SAID FIRST CHAMBER LYING IN A PLANE INCLINED RELATIVE TO THE LONGITUDINAL CENTER LINE OF SAID HOUSING IN A DIRECTION TOWARD SAID INNER END HEADER TO PROVIDE FOR A UNIFORM FLOW AND EXPANSION OF EXHAUST GASES AND WATER INTO SAID FIRST CHAMBER, AND AN OUTLET TUBE EXTENDING THROUGH SAID OUTER END HEADER INTO SAID SECOND CHAMBER, SAID OUTLET TUBE BEING IN LATERALLY OFFSET PARALLEL RELATION TO THE LONGITUDINAL CENTER LINE OF SAID TUBULAR HOUSING AT THE DIAMETRICALLY OPPOSITE SIDE OF SAID CENTER LINE FROM SAID ALIGNED INLET TUBE AND DUCTS, THE END OF SAID OUTLET TUBE WITHIN SAID SECOND CHAMBER LYING IN A PLANE INCLINED RELATIVE TO THE LONGITUDINAL CENTER LINE OF SAID HOUSING IN A DIRECTION TOWARD SAID OUTER END HEADER TO PROVIDE FOR A SMOOTH FLOW OF EXHAUST GASES AND WATER FROM SAID SECOND CHAMBER, THE ALIGNMENT OF SAID INLET TUBE AND DUCTS SERVING TO REDUCE BACK PRESSURE IN THE MUFFLER, THE ENDS OF SAID DUCTS AND THE INCLINED ENDS OF SAID TUBES BEING OPEN AND UNOBSTRUCTED TO FURTHER REDUCE BACK PRESSURE.