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Drawn sheet glass - sometimes called window glass or drawn glass – is
made by dipping a leader into a vat of molten glass then pulling that leader
straight up while a film of glass hardened just out of the vat. This film or
ribbon is pulled up continuously and held by tractors on both edges while
it cools. After 12 meters (40 feet) or so it is cut off the vertical ribbon and
tipped down to be further cut.

This glass has thickness variations due to small temperature variations as it
hardens. These variations cause slight distortions. You may still see this glass in older houses.

In more recent times, float glass replaced this process.

Edited from Wikipedia and other sources

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