What does crown glass mean?

Definitions for crown glass
crown glass

Here are all the possible meanings and translations of the word crown glass.

Princeton's WordNet

  1. crown glassnoun

    a glass blown into a globe which is later flattened and spun to form a disk

  2. optical crown, crown glass, optical crown glassnoun

    optical glass of low dispersion and low refractive index

Freebase

  1. Crown glass

    Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index and low dispersion. Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses. As well as the specific material named crown glass, there are other optical glasses with similar properties that are also called crown glasses. Generally, this is any glass with Abbe numbers in the range 50 to 85. For example, the borosilicate glass Schott BK7 is an extremely common crown glass, used in precision lenses. Borosilicates contain about 10% boric oxide, have good optical and mechanical characteristics, and are resistant to chemical and environmental damage. Other additives used in crown glasses include zinc oxide, phosphorus pentoxide, barium oxide, fluorite and lanthanum oxide. A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet. The dispersions of the glasses partially compensate for each other, producing reduced chromatic aberration compared to a singlet lens with the same focal length.

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Numerology

  1. Chaldean Numerology

    The numerical value of crown glass in Chaldean Numerology is: 9

  2. Pythagorean Numerology

    The numerical value of crown glass in Pythagorean Numerology is: 5

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    "crown glass." Definitions.net. STANDS4 LLC, 2022. Web. 26 Jun 2022. <https://www.definitions.net/definition/crown+glass>.

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