Society of Glass Technology · [Sheffield] · leaf 544
Fig. 47. … Fig. 48. lowered, so that the rollers, 17, press the cylinder outwards. Thecylinder, being pressed outwards at four points only, is stretchedso that its walls between the rollers become flat, and the result isa cylinder which is square in cross-section. In a modification,the rollers and arms are…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
