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Broad sheet is a type of hand-blown glass. It is made by blowing molten
glass into an elongated balloon shape with a blowpipe. Then, while the
glass is still hot, the ends are cut off and the resulting cylinder is split
with shears and flattened on an iron plate. (This is the forerunner of the
cylinder process). The quality of broad sheet glass is not good, with many
imperfections. Due to the relatively small sizes blown, broad sheet was
typically made into leadlights.

According to the website of the London Crown Glass Company, broad sheet glass was first made in the UK in Sussex in 1226 C.E. This glass was of poor quality and fairly opaque. Manufacture slowly decreased and ceased by the early 16th Century. French glassmakers and others were making broad sheet glass earlier than this.

Edited from Wikipedia and other sources

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