Machine drawn cylinder sheet was the first mechanical method for "drawing" window glass.
Cylinders of glass 40 feet (12 m) high are drawn vertically from a circular tank.
The glass is then annealed and cut into 7 to 10 foot (2 to 3 m) cylinders.
Other historical methods for making window glass included broad sheet, blown plate, crown glass, polished plate and cylinder blown sheet.
The early 20th century marks the move away from hand-blown to machine manufactured glass such as rolled plate, flat drawn sheet, single and twin ground polished plate and float glass.