Abstract: A closed liquid cooling system is provided within a mold body and pressurized to a desired extent so as to control the amount of heat removed from a glass-contacting mold wall portion through nucleate boiling, while simultaneously creating a thermal-siphon effect to avoid film boiling which would create an undesirable vapor insulating layer adjacent such mold wall.

Abstract: A differentially cooled plunger cooperative with a mold for press forming glass articles and the method of cooling pressed glass articles formed in said mold by use of the pressing plunger. The plunger is designed so that cooling fluid may be supplied from a single source thereof to different zones or regions of the plunger for differential cooling of the zones or regions and of a glass article press formed by the plunger.

Abstract: An apparatus assembly for distributing and adjusting flow of cooling fluid to control the temperature of a glass forming mold used for forming generally funnel-shaped articles such as, for example, funnel members for glass television picture tube envelopes, the assembly including a cooling fluid distributor in the form of an orifice member or perforate baffle and a plurality of adjustable valves for selectively adjusting and directing the flow of the cooling fluid to and about different parts of the outer surface of the forming mold for selective temperature control of the mold during the forming of glass articles therein.