Improved process for and apparatus for use in moulding articles of fused quartz

摘要

336,493. Deutsch-Englische Quarzschmelze Ges. Dec. 12, 1928, [Convention date]. Insulators.-An insulator c having one or more circumferential ribs or collars e is made from a tube of fused quartz. The quartz is expanded in a mould by compressed air to form a circumferential bulge, and the bulge is then flattened by mechanical pressure.