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Rarecrown glass
The correct spelling is crown glass.
How to pronounce crown glass
noun
Say it like: Cro-wn -gla-ss
The correct spelling is crown glass. An early type of window glass made by blowing glass into a hollow globe (crown) and then flattening it on a punty, reheating and spinning out into a flat disk by centrifugal force. For example: "The convex half of an achromatic lens is composed of crown glass."
Usage Examples
“The convex half of an achromatic lens is composed of crown glass.”
Definition
noun
- 1.An early type of window glass made by blowing glass into a hollow globe (crown) and then flattening it on a punty, reheating and spinning out into a flat disk by centrifugal force.
- 2.A variety of glass used in lenses and other optical components due to its low refractive index and dispersion. Originally crown glass was made from alkali-lime silicates with approximately 10% potassium oxide, but similar properties may be attained with other recipes.
Similar words
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