Ppg Industries, Inc.

James E Harris

John F Krumwiede

William C Harrell

William G Hilliard

In a glass melting furnace, the beneficial effects of passing molten glass streams through the intensified heating at the surface of the 'spring zone' are enhanced by the use of bubblers. In one aspect, the rate of bubbling is greater near a side wall of the furnace than in the center immediately upstream of the spring zone so as to direct side portions of the throughput stream into the spring zone. In another aspect of the invention, the rising currents of the spring zone are enhanced by bubbling a stream entering the spring zone at a first elevation and then bubbling the same stream portion at a higher elevation.

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Wichita Falls, TX, United States of America

James E Harris