Society of Glass Technology · [Sheffield] · leaf 669
tightened to let out the strands between the twists,and then, while the sheet retains some of its initial heat, corrugatingit by passing it between rolls having ribbed surfaces. G. D. 320. A Method of Making Varicoloured Glass Articles.F. M. Sigvart (U.S.A. Pat., No. 1372164, March 22nd, 1921.Filed… … Fig. 184. and blown to shape. The mould, 5, Fig. 184, is fitted with a sleeveor liner, 8, which extends about half-way down the mould cavityand has a serrated lower edge, 8. In the first part of the operation,a quantity of metal is placed in the mould and is pressed by aplunger, 11, which fits…
Glass
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