CROWN GLASS Definition & Meaning

crown glass

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

another 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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First recorded in 1700–10

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Examples have not been reviewed.

Transparent media vary in their dispersive powers; for example, carbon disulphide has more than three times the dispersive power of crown glass.

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The old staple trade of the making of crown glass, begun in 1777, lapsed some 70 years afterwards when the glass duty was abolished.

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By studying the dispersion of colours in water, turpentine and crown glass Newton was led to suppose that dispersion is proportional to refraction.

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Achromatic Object Glass. a, crown glass; b, flint glass.

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A compound lens is needed, made up of a crown glass convex element, B, and a concave element, A, of flint glass.

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