Marine type muffler

Claim 1

A MARINE TYPE MUFFLE 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, SAID THIRD CHAMBER BEING LARGER IN VOLUME THAN SAID SECOND CHAMBER AND SMALLER IN VOLUME THAN SAID FRIST CHAMBER, AN INLET TUBE EXTENDING THROUGH SAID INNER END HEADER INTO SAID FIRST CHAMBER, SAID INLET TUBE BEING DISPOSED ADJACENT TO THE SIDE WALL OF SAID TUBULAR HOUSING IN LATERALLY OFFSET PARALLEL RELATION TO THE LONGITUDINAL CENTER LINE OF SAID TUBULAR HOUSING, AN ACOUSTICAL COUPLING DUCT EXTENDING THROUGH AND SECURED TO ONE OF SAID PARTITIONS, A SECOND ACOUSTICAL COUPLING DUCT EXTENDING THROUGH AND SECURED TO THE OTHER OF SAID PARTITIONS, SAID DUCTS PLACING SAID CHAMBERS IN COMMUNICATION WITH ONE ANOTHER, AN OUTLET TUBE EXTENDING THROUGH SAID OUTER END HEADER INTO SAID SECOND CHAMBER, SAID OUTLET 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 AT THE DIAMETRICALLY OPPOSITE SIDE OF SAID CENTER LINE FROM SAID INLET TUBE, THE END OF SAID INLET TUBE WITHIN SAID FIRST CHAMBER LYING IN A PLANE INCLINED RADIALLY AND AXIALLY INWARDLY RELATIVE TO SAID HOUSING AT AN ACUTE ANGLE TO THE LONGITUDINAL CENTER LINE OF SAID HOUSING TO PROVIDE FOR A UNIFORM FLOW AND EXPANSION OF EXHAUST GASES AND WATER INTO SAID FIRST CHAMBER, THE END OF SAID OUTLET TUBE WITHIN SAID SECOND CHAMBER LYING IN A PLANE INCLINED RADIALLY INWARDLY AND AXIALLY OUTWARDLY RELATIVE TO SAID HOUSING AT AN ANGLE TO THE LONGITUDINAL CENTER LINE OF SAID HOUSING TO PROVIDE FOR A SMOOTH FLOW AT EXHAUST GASES AND WATER FROM SAID SECOND CHAMBER, THE ARRAGEMENT OF SAID TUBES 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.