Crown glass

Crown glass

Sheet glass made by blowing a parison, cutting it open, and rotating it rapidly, with repeated reheating, until the centrifugal force has caused it to become a flat disk. After annealing, the disk is cut into panes of the required shape and size. Bull’s-eye panes come from the centers of the disks and preserve the thickened area where the parison was attached to the pontil.

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