Old Antique

Why did the old antique windows have circles on them?

I was watching Sleepy Hollow and some other movies set in the early 19 century and all the windows had these little circles in at least one of the panes of glass each window. Why?

The appearance is called "bullseye" and occurs because the panes are made from blown glass. Molten glass is mouth blown to create a large bubble of even thickness.

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