Society of Glass Technology · [Sheffield] · leaf 740
).—A length of tube is rotated on rollers, and one end heated until softened. A tool, similar to a bottle-neck tool, is then brought up to the heated end, where its centre pin fits into a recess in a plug maintained inside jrIG- iggg the glass tube. The action of the tool and plug produces a square…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
