Society of Glass Technology · [Sheffield] · leaf 691
ock for grinding. The pitch is heated and mechanically stirred 208 JOUENAL OF THE SOCIETY OF GLASS TECHNOLOGY. in a closed steam-jacketed vessel, 11, the heat being so regulatedthat deterioration of the pitch or loss of volatile constituents isavoided, and the stirring is accomplished by means of… … Fig, 169. mounted on an intermittently rotated table, 33, and are positionedfirst under a nozzle, which sprays the lens with material to makethe pitch adhere thereto, then under the pitch delivery nozzle,and finally under a plunger, B, adapted to- be depressed by meansof a lever, 47, which produces…
Glass
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