1) Glass composition
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https://www.crosswordclues.com/clue/crown-glass
Crown glass is either of two kinds of glass: ...
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http://en.wikipedia.org/wiki/Crown_glass
[optics] Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers around 60). Crown glass is produced from alkali-lime (RCH) silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasse...
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http://en.wikipedia.org/wiki/Crown_glass_(optics)
[window] Crown glass was an early type of window glass. In this process, glass was blown into a `crown` or hollow globe. This was then transferred from the blowpipe to a punty and then flattened by reheating and spinning out the bowl-shaped piece of glass (bullion) into a flat disk by centrifugal force, up to 5 or 6 feet (1.5 to 1.8 metres)...
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http://en.wikipedia.org/wiki/Crown_glass_(window)
A clear optical soda glass with low light refraction.
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http://www.antique-marks.com/antique-terms-c.html
handmade glass of soda-lime composition for domestic glazing or optical uses. The technique of crown glass remained standard from the earliest times: ... [5 related articles]
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http://www.britannica.com/eb/a-z/c/163
Soda-lime glass used to make lenses and prisms. It has a lower refractive index and less dispersion than flint glass, but is more durable. Related entry • achromatic
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http://www.daviddarling.info/encyclopedia/C/crown_glass.html
A compound of lime, potash, alumina, and silica; commonly used in lenses; has a low dispersion (52.2) relative to index of refraction (1.523). ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
A clear optical soda glass with low light refraction.
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http://www.encyclo.co.uk/visitor-contributions.php
Type: Term Definitions: 1. a compound of lime, potash, alumina, and silica; commonly used in lenses; has a low dispersion (52.2) relative to index of refraction (1.523).
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http://www.medilexicon.com/medicaldictionary.php?t=37377
Crown-glass is the hardest and most colourless kind of window-glass, made almost entirely of sand and alkali and a little lime, and used in connection with flint-glass for optical instruments in order to destroy the disagreeable effect of the aberration of colours.
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http://www.probertencyclopaedia.com/browse/AC1.HTM
[
n] - a glass blown into a globe which is later flattened and spun to form a disk
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http://www.webdictionary.co.uk/definition.php?query=crown%20glass
glass used for windows.
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http://www2.shu.ac.uk/sfca/glossary.cfm
A silicate glass containing oxides of sodium and potassium, used in compound lenses and spectacles; harder than flint glass, with low index and low dispersion.
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https://www.encyclo.co.uk/local/20687
an optical glass of low dispersion and generally low index of refraction. · an old form of window glass formed by blowing a globe and whirling it into a disk.
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https://www.infoplease.com/dictionary/crown-glass
No exact match found.
