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Cylinder blown sheet is a type of hand-blown window glass. It is created with a similar process to broad sheet, but with the use of larger cylinders. In this manufacturing process glass is blown into a cylindrical shape by a glass blower. The ends of the cylinder are cut off and a cut is made down the side of the cylinder.
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. These are cut lengthways, reheated, and flattened.
Metropolitan Museum of Art The sliced tube of glass is flattened in an oven as part of the process for making window glass using the cylinder method. Flint glass is usually glassware, although it can be bottles and lamp chimneys. The glass composition could either include lead (usually called crystal) or soda and lime (soda–lime glass). [6]
Archeological evidence indicates that window glass was made using the cylinder method. Various types of bottles were also made. The glass works appears to have operated through 1784. [117] Schuylkill glass works: In 1794 John Nicholson built a glass works on the west side of Philadelphia at the falls of the Schuylkill River. [30]
Until the 20th century, window glass production involved blowing a cylinder and flattening it. [9] Two major methods to make window glass, the crown method and the cylinder method, were used until the process was changed much later in the 1920s. [10] All glass products must then be cooled gradually , or else they could easily break. [11]
This window from a basilica in the Czech Republic, constructed in the 1200s, would have used the unrolled cylinder method of construction. The first recorded use of glazing in windows was by the Romans in the first century AD. This glass was rudimentary, essentially a blown cylinder that had been flattened out, and was not very transparent.
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