A wide variety of products are manufactured by the glass industry, such as optical lenses, glass plates, windshields, preforms for drawing optical fibers used in telecommunications, fiberglass, and various consumer products. Glass is produced in melting furnaces or tanks, in which combustion of fossil fuels or electrical heating results in the melting of the raw materials or batch. The molten glass flows out of the melting tank through a glass delivery system for further processing. This transfer of molten glass may be driven by gravity, and as the molten glass is poured into molds or casts or other enclosures, the glass stream may “neck down” and form a gravity-driven viscous jet.