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This glass was produced by pouring the molten glass onto a metal table
and sometimes rolling it. The glass thus produced was heavily textured by
the reaction of the glass with the cold metal. Glass of this appearance is
commercially produced and widely used today, under the name of cathedral
glass, although it was not the type of glass favoured for stained glass in
ancient cathedrals. It has been much used for lead lighting in churches in
the 20th century.

Rolled plate glass
The glass is taken from the furnace in large iron ladles and poured on the cast-iron bed of a rolling-table. It is rolled into sheet by an iron roller. The rolled sheet is roughly trimmed while hot and soft and is pushed into the open mouth of a lehr, down which it is carried by a system of rollers.

Figure rolled glass
The elaborate patterns found on figure rolled glass are produced by in a similar fashion to the rolled plate glass process except that the plate is cast between two moving rollers. The pattern is impressed upon the sheet by a printing roller which is brought down upon the glass as it leaves the main rolls while still soft. This glass shows a pattern in high relief. The glass is then annealed in a lehr.

Edited from Wikipedia and other sources

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