Crown glass

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crown glass

[′krau̇n ‚glas]
(materials)
A soda-lime glass, typically having 72% SiO2, 13% CaO, and 15% Na2O, which is hard and will take a simple polish; highly transparent for visible light.

Crown glass

1. An early form of window glass, cut from blown disks.
2. The glass made by blowing a mass of molten material, which is then flattened into a disk and spun into a cular sheet.
See also: Glass

crown glass

A handmade glass of soda-lime composition, used for windows; manufactured in the early 19th century by a now-obsolete process in which a hollow sphere of glass was blown while still very soft, then spun to form a large, nearly flat circular disk. During the spinning process, ripple lines were formed in a pattern of concentric circles, with their center at the center of the spun disk; this central area was used in a bull’s eye window. Also see glass.