crown glass

Synonyymisanakirja

crown glass

optinen lasi, kruunulasi, lasi.

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Englannin sanakirja

crown glass (englanti > suomi)

1. kruunulasi, pullonpohjalasi

2. kruunulasi

crown glass englanniksi

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. puhekieltä A variety of glass used in lense lenses and other optical components due to its low refractive index and dispersion. Originally crown glass was made from alkali-lime silicate silicates with approximately 10% potassium oxide, but similar properties may be attained with other recipes.

The convex half of an achromatic lens is composed of crown glass.

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