This glass was blown into a ball cut open and spun.
Crown glass window.
Crown glass is produced from alkali lime silicates containing approximately 10 potassium oxide and is one of the earliest low dispersion glasses.
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In this process glass was blown into a crown or hollow globe.
These circular pieces of glass were then cut and are identifiable by the circular striations in the panes of glass.
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The process of making crown glass was first perfected by french glassmakers in the 1320s.
Crown glass is a type of optical glass used in lenses and other optical components.
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It has relatively low refractive index 1 52 and low dispersion with abbe numbers around 60.
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.
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The earliest type of glass in america was called crown or table glass.
Crown glass was an early type of window glass.
This is very early glass most common before 1800.
A bubble of glass blown into a pear shape and flattened was transferred to the glass maker s pontil a solid iron rod reheated and rotated at speed until centrifugal force formed a large circular plate of up to 60 inches in diameter.
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