Society of Glass Technology · [Sheffield] · leaf 533
of the tube may be situated withintlie discharge opening or slightly above the bottom of the vessel.As shown in Fig. 90, the tube is replaced by a lateral passage, 12,formed in an offset, 13, of the reservoir, 1, and connected by apassage, 14, to a source of vacuum. The passage, 12, takes theglass… … MACHmERY FOR THE WORKING OTT GLASS. 155 213 Grinding and Polishing Machine foi- Lenses. W. S. Tannek (Brit. Pat. No. 120827, Feb. 4tli, 1918, No. 1985).—In a machine for grinding and polishing lenses, etc., a numberof grinding-heads are carried on a table. /// (Fig. 92), mounted toturn flbout a…
Glass
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