Refractory pouring tube for degassing vessels

Claim 1

A DEVICE FOR DEGASSING MOLTEN COMPRISED OF LADLE MEANS FOR CONTAINING MOLTEN METAL, CHAMBER MEANS FOR REMOVING GASES FROM SAID METAL, SAID CHAMBER MEANS POSITIONED ABOVE SAID LADLE MEANS, AND CONDUIT MEANS, SAID CONDUIT MEANS HAVING AN UPPER AND A LOWER END, SAID CONDUIT MEANS BEGING FIXED IN OPEN COMMUNICATION AT ITS UPPER END TO SAID CHAMBER MEANS AND POSITIONED FOR IMMERSION OF ITS LOWER END INTO SAID LADLE MEANS; SAID CONDUIT MEANS BEING COMPRISED OF A PLURALITY OF CONCENTRIC, COOPERATIVELY INTERLOCKING CYLINDERS, SAID CYLINDERS BEING COMPRISED OF: AN INNER CYLINDER OF HIGH PURITY DEAD BURNED MAGNESITE SHAPES, A CYLINDER OF INSULATING REFRACTORY SHAPES CONTIGUOUSLY SURROUNDING THE MAJOR EXTEND OF SAID INNER CYLINDER, A METAL SUPPORTING CYLINDER CONTIGUOUSLY SURROUNDING THE MAJOR EXTENT OF SAID INSULATING REFRACTORY CYLINDER, SAID CYLINDER HAVING INNER AND OUTER SURFACES, THERE BEING METAL FLANGES EXTENDING FROM THE INNER SURFACE TO SUPPORT SAID MAGNESITE AND INSULATING REFRACTORY CYLINDERS, THERE BEING METAL ANCHORS EXTENDING FROM SAID OUTER SURFACE, A CYLINDER OF COMPRESSIBLE REFRACTORY MATERIAL ADJACENT BOTH INNER AND OUTER SURFACES OF THE METAL SUPPORTING CYLINDER, AN ADDITIONAL CYLINDER OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF A FIRECLAY AND HIGH ALUMINA MONOLITHIC REFRACTORIES, HELD IN PLACE BY SAID ANCHORS SUBSTANTIALLY ENTIRELY COVERING SAID OUTER SURFACE OF SAID METAL CYLINDER AND, THERE BEING A RIM ATTACHED AT SAID LOWER END OF SAID CONDUIT COMPRISED OF DENSE ABRASIVE RESISTANT REFRACTORIES.