Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. glass (material)
8. [glass by technique]

Anotations

Scope note:

Flat pane glass characterized by straight ripples. Is made by an an ancient technique of blowing a large glass bubble and swinging it on a blow-pipe to form a long bottle, then cutting off both hemispherical ends. The resulting cylinder is then cut lengthwise and reheated after which it is flattened by a wooden plane or by being allowed to sink to a flat state. Traditionally, it was characterized by a great variability of texture, color, and thickness, though it is more regular when produced by modern methods. Cylinder glass largely replaced crown glass when the process of making it was mechanized.