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Last edited 11 Aug 2021
Historic England 2020 Stained Glass Windows: Managing Environmental Deterioration, Swindon, Historic England, published in 2020 defines broad glass, or cylinder glass as: “The principal method of making sheet glass by hand, developed in the early Middle Ages, and still in use. The glass maker swings a bubble of molten glass back and forth whilst blowing, producing an elongated balloon. The end of the balloon is opened out using a hot iron tool, and it is then cut from the blowing rod to produce a cylinder of glass. This is scored down its length and returned to a kiln, where the heat causes the cylinder to open out along the scored line and flatten into a sheet.”
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