Machine drawn cylinder sheet was the first mechanical method for "drawing" windowglass. Cylinders of glass 40 feet (12 m) high are drawn vertically from a circular tank. The glass is thenannealed and cut into 7-to-10-foot (2.1 to 3.0 m) cylinders. These are cut lengthways, reheated, and flattened.
This process was invented in the US in 1903. This type of glass was manufactured in the early 20th century (it was manufactured in the United Kingdom byPilkington from 1910 to 1933).
Other historical methods for making window glass includedbroad sheet,blown plate,crown glass,polished plate andcylinder blown sheet. 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 asrolled plate,flat drawn sheet,single and twin ground polished plate andfloat glass.
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