broad glass
Quick Summary
"Broad glass" is a term for cylinder glass. Historically, it was a method for producing window glass where a large cylinder was blown, then slit and reheated to flatten. This process, practiced into the 20th century, yielded flatter glass than the earlier crown glass method and allowed for larger pieces. However, broad glass still had surface waviness and thickness variations. Modern flat glass production primarily uses the float process, where molten glass is floated on a bed of molten tin to create a smooth, uniform sheet.123
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