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A concertina is a free-reed musical instrument, like the various accordions and the harmonica.It consists of expanding and contracting bellows, with buttons (or keys) usually on both ends, unlike accordion buttons, which are on the front.
The Cologne Cathedral Window is the stained glass window in the south transept of the Cologne Cathedral designed by Cologne artist Gerhard Richter. On a surface of 106 square metres, 11,263 glass squares in 72 colours of 9,6 cm × 9.6 cm were principally arranged randomly, with others selected in response to architectural context. [ 1 ]
This is a list of public art in Millbank, a district in the City of Westminster, London.. Millbank is the location of Tate Britain and the Chelsea College of Arts; the latter institution's Rootstein Hopkins Parade Ground is a large temporary exhibition space for the work of students and established artists.
Unless stated otherwise, the properties of fused silica (quartz glass) and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors (in general more than 10 independent sources for quartz glass and T g of germanium oxide glass). The list is not exhaustive.
Glass can be "double rolled", which means it is passed through two cylinders at once (similar to the clothes wringers on older washing machines) to yield glass of a specified thickness (typically about 1/8" or 3mm). The glass is then annealed. Rolled glass was first commercially produced around the mid-1830s and is widely used today.
The stained glass windows of Chartres Cathedral are held to be one of the best-preserved and most complete set of medieval stained glass, notably celebrated for their colours, especially their cobalt blue. They cover 2600 square metres in total and consist of 172 bays illustrating biblical scenes, the lives of the saints and scenes from the ...
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Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass.