Cylinder glass

Cylinder glass

Cylinder glass

Window glass made by inflating a large gather and swinging it until it forms a cylinder. The cylinder is then detached from the blowpipe, and both ends are removed with shears. Next, the cylinder (sometimes known as a muff) is cut lengthwise, reheated, and either tooled or allowed to slump until it assumes the form of a flat sheet. After annealing, the sheet is cut into panes.

Term Variations: 
Broad glass