This is very early glass most common before 1800.
Crown glass window.
The earliest type of glass in america was called crown or table glass.
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.
In this process glass was blown into a crown or hollow globe.
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It has relatively low refractive index 1 52 and low dispersion with abbe numbers around 60.
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This glass was blown into a ball cut open and spun.
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.
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Crown glass was one of the two most commonly used types of glass for windows up until the 19th century the other being blown plate glass.
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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Crown glass was an early type of window glass.
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The technique of crown glass remained standard from the earliest times.