Glossary – our knowledge from A to Z
131 terms in C found.
crown glass
A large manually blown globe of glass is rotated to form a circular disc which, after annealing is cut into panes. This glass is characterised by its concentric structure. The thicker section, or boss, left in the centre where the pontil rod was attached is the bull’s eye or bullion sometimes seen in old windows and imitated today. This form of glass production is no longer common.
