Society of Glass Technology · [Sheffield] · leaf 541
ns in a mould, 5, supported on a refractoryplate, 6, heated by a burner, 9. Fig. 40 shows the device thus 58 JOURNAL OF THE SOCIETY OF GLASS TECHNOLOGY. formed used for forming perforations in a die, 11. If the perfora-tion is effected when the glass is at the right temperature, conedperforations…
Glass
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