Society of Glass Technology · [Sheffield] · leaf 659
30, by air admitted through the passages, 10, 11, thetemporary shoulder formed inside the parison disappears and theplunger can be withdrawn from the finished article. The plungercan also be used with machines which gather by suction. G. D. 249. Making Vacuum Bottles. Harry Bastow (U.S.A.… … Fig. 1.31. Fig. 132. core, 12, a two-part body, 14, and a ring mould, 20, with a depend-ing annular core, 22, which at one or more places, 23, is extendedto meet the core, 12. After removal from the mould, the blank,of the shape shown, is warmed in, and the walls and bottom areclosed in by hand to…
Glass
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