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Crown glass. Crown glass was an early type of window glass. In this process, glass was blown into a "crown" or hollow globe. This was then transferred from the blowpipe to a punty and then flattened by reheating and spinning out the bowl-shaped piece of glass (bullion) into a flat disk by centrifugal force, up to 5 or 6 feet (1.5 to 1.8 metres) in diameter.
Exterior of the Bullseye Resource Center Portland, 2021. Bullseye Glass Company was founded in 1974 by Dan Schwoerer, Boyce Lundstrom, and Ray Ahlgren. [5] In early 2016, high levels of the toxic heavy metals cadmium, arsenic and chromium were discovered in the vicinity of the company's plant in East Portland. [6]
Centrifugal force shaped the hot globe of glass into a round, flat sheet. The sheet would then be broken off the pipe and trimmed to form a rectangular window to fit into a frame. At the center of a piece of crown glass, a thick remnant of the original blown bottle neck would remain, hence the name "bullseye".
Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses .
It is a 1 + 1 ⁄ 2-story wood-frame structure, five bays wide, with a side-gable roof and a large central chimney. The front door, centered on the main facade, is framed by sidelight windows with reproduced bullseye glass panes and pilasters. The interior has a typical central chimney plan, with an entry vestibule that also houses a narrow ...
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Oeil-de-boeuf, an ornamental window with a circular frame; A window made from crown glass; Porthole, a circular nautical window; ... Bullseye Glass, an American company;
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