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crown glass
noun
- 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.
crown glass
noun
- See optical crownanother name for optical crown
- an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
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Word History and Origins
Origin of crown glass1
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Example Sentences
In making crown-glass, which is used for windows, a slight alteration in the process is observed.
The focal length of double convex lenses of crown glass is about the same as the radius of curvature of either surface.
The achromatic lens consists of a double convex lens of crown glass combined with a plano-concave lens of flint glass.
English crown-glass; excellent quality, but not so white as the last.
Such a mixture will produce a dull metal, very attractive of moisture: defects to which the French crown-glass also is subject.
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