Society of Glass Technology · [Sheffield] · leaf 483
stingon the rim of the drawing-pot, 2.The tube, 11, is enclosed in anothertube, 10, through which water iscirculated both to cool the tube,11, and to co-operate with thebait in chilling the metal at thecommencement of the draw. Thering also rests on the edge of thepot and covers the space… … Fig. 47. 88. Grinding or Polishing Lenses. B. Wolinski, West-cliff-on-Sea (Brit. Pat., December 9th, 1918,No. 135960. Filed December 9th, 1918,No. 20393).—A machine for grinding andpolishing cylindrical lenses comprises twospindles, j, k, driven at the same speedand in the same direction through…
Glass
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