crown glass
Americannoun
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an optical glass of low dispersion and generally low index of refraction.
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an old form of window glass formed by blowing a globe and whirling it into a disk.
noun
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another name for optical crown
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an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
Etymology
Origin of crown glass
First recorded in 1700–10
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"We've looked everywhere and can't find anyone that can cast crown glass," he said.
From BBC ● Oct. 23, 2017
Suppose Figure 25.53 represents a ray of light going from air through crown glass into water, such as going into a fish tank.
From Textbooks ● Aug. 12, 2015
Find the range of visible wavelengths of light in crown glass.
From Textbooks ● Aug. 12, 2015
What is the ratio of thicknesses of crown glass and water that would contain the same number of wavelengths of light?
From Textbooks ● Aug. 12, 2015
A compound lens is needed, made up of a crown glass convex element, B, and a concave element, A, of flint glass.
From How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use by Archibald Williams
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
