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.
Other methods for making hand-blown glass included blown plate glass, crown glass, polished plate glass and cylinder blown sheet glass. These methods of manufacture lasted at least until the end of the 19th Century. The early 20th century marks the move away from hand-blown to machine manufactured glass such as rolled plate glass, machine drawn cylinder sheet glass, flat drawn sheet glass, single and twin ground polished plate glass and float glass.
According to the website of the London Crown Glass Company, broad sheet glass was first made in the UK in Sussex in 1226 CE. 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.
Famous quotes containing the words broad, sheet and/or glass:
“It will be no excuse to an idle and untoward servant, who would not attend his business by candle-light, to plead that he had not broad sun-shine. The candle, that is set up in us, shines bright enough for all our purposes.”
—John Locke (1632–1704)
“A speck that would have been beneath my sight
On any but a paper sheet so white
Set off across what I had written there.”
—Robert Frost (1874–1963)
“Or your liquors seep to me, in this glass capsule,
Dulling and stilling.
But colourless. Colourless.”
—Sylvia Plath (1932–1963)