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crown-glass
ˈcrown-ˌglass A kind of glass composed of silica, potash, and lime (without lead or iron), made in circular sheets by blowing and whirling. It is the sort commonly used in Great Britain for windows, and the best quality is used in combination with flint glass to render dioptric instruments achromati...
Oxford English Dictionary
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Crown glass
Crown glass is either of two kinds of glass:
Crown glass (window) was a type of hand-blown window glass. Crown glass (optics) is a type of optical glass used in lenses.
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Crown glass (window)
Crown glass was an early type of window glass. In this process, glass was blown into a "crown" or hollow globe. Hence crown glass was not made in London until 1678.
Crown glass is one of many types of hand-blown glass.
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Crown glass (optics)
History
The term originated from crown-glass windows, a method of window production that began in France during the Middle Ages. Video of blowing crown glass by Corning Museum of Glass
Glass compositions
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Crown Fountain
glass and cast iron molds. The glass is white glass, rather than the usual green glass that results from iron impurities.
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Flint glass
Applications
A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their See also
Crown glass (optics)
Chromatic aberration
Cup plate
References
Glass compositions
Diamond simulants
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Crown Liquor Saloon
The Crown owes its elaborate tiling, stained glass and woodwork to the Italian craftsmen whom Flanagan persuaded to work on the pub after hours. Extra privacy was then afforded by the pub's etched and stained glass windows which feature painted shells, fairies, pineapples, fleurs-de-lis and clowns
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Bullseye (target)
In this sense, it was commonly used to describe the pontil mark on medieval crown-glass windows, where a blob (bullion, from the French boule) of molten The bullseye was too thick for making windows, but often used for making crown-glass lenses or deck prisms in ships, to let in light to the hold below
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双合透镜
这两片透镜分别用折射率和色散都不同的玻璃制成,通常一片是冕牌玻璃(Crown glass),另外一片是燧石玻璃(flint glass)。这样的组合产生的影像品质比单一透镜好。而早已灭绝的三叶虫,拥有由方解石构成的天然的双合透镜。
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Bridal crown
Regional variations
In Norway, Sweden and Serbia, bridal crowns were made of silver; in Bavaria and Silesia of gold wire, glass stones and glittering In the Black Forest, bridal crowns also have pearls, glass balls, mirrors and ribbons or paper roses.
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孙承德
Danger》、《I NEED U》、《RUN》、《FIRE》、《Blood Sweat & Tears》、《Spring Day》、《DNA》、《FAKE LOVE》、《IDOL》、《Boy with Luv》、《Permission to Dance》等
TOMORROW X TOGETHER:《CROWN JUMP:《Banger Night》
ENHYPEN:《Drunk-Dazed》、《FEVER》
女子团体
GFRIEND:《Glass Bead》(与朴俊熙合作)、《Love Whisper》
奖项
注释
参考资料
外部连结
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Crown of the Netherlands
huge and unusable construction of gilded copper, pearls made of pasted fishskin and coloured glass. It was made of gilded silver, balls covered with fish skin and glass with coloured foil behind it. The lining was made of red silk.
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Borosilicate glass
, a very finely made borosilicate crown glass. Other less costly borosilicate glasses, such as Schott B270 or the equivalent, are used to make "crown-glass" eyeglass lenses.
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K9 glass
K9 glass, sometimes referred to as K9 crystal, is a variety of optical borosilicate crown glass. Its refractive index is 1.517 at 590 nm wavelength (compared to 1.523 for crown glass (soda-lime) and 1.618 for 45% leaded glass) Its clarity (90% transmission
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Basil Glass
Basil Glass (21 April 1926 – 30 September 2005) was a politician in Northern Ireland. He was described by John Wilson QC, Clerk of the Crown for Northern Ireland, as "a gentleman and a scholar."
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