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.
References in periodicals archive ?
Hall therefore decided to make a convex lens out of crown glass and a concave lens out of flint glass, designed in such a way that the two would fit together to form a single biconvex lens.
Seeing the Northern Lights is high on most people's wish–lists and this dream came true for me in the coolest of locations – the Golden Crown Glass Igloos in Levi, Lapland (inghams.
The FS22 has a 16(W) x 24(L) mm crown glass finger scanning window and includes a Live Finger Detection (LFD) function for spoof prevention.
The firm, which began in 1826 as St Helens Crown Glass, employs nearly 1,300 people in the Merseyside town.
Richter's design called for BK-7 optical glass, but since this is difficult to obtain in Argentina I opted for ophthalmic crown glass instead.