METHOD AND APPARATUS FOR DELIVERING A CASED GLASS STREAM

Apparatus for forming a cased glass stream having an inner core glass surrounded by an outer casing glass includes a first orifice for receiving c ore glass from a first source, and a second orifice vertically spaced beneath and aligned with the first orifice. A chamber surrounds the second orifice and communicates with the second orific e through a metering gap between the first and second orifices. Casing glass is delivere d from a second source to one side of the chamber such that glass flows by gravity from both the first and second sources through the orifices to form the cased glass stream. In accor dance with one aspect of the present invention, the metering gap is of non-uniform dimensio n around the chamber, providing greater resistance to glass flow through the metering gap on a side thereof adjacent to the side of the chamber that receives casing glass from the seco nd source and less resistance to glass flow through the metering gap on the side thereof remote from the side of the chamber that receives the casing glass.