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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
s on the sides of decanters and similar objects, and the concave form the convex ribs called pillars. The wheels for first or rough grinding are of iron, and a considerable quantity of sand is employed; the work is then smoothed upon fine grit stones, rendered circularly true and very smooth, less water and no sand being used; after which they are polished upon wooden wheels with pumice and rottenstone and water, and the final luster imparted by wet puttypowder applied on similar wheels. Tilghman's process for cutting glass or stone by means of a blast of air or steam carrying a stream of sand is adapted for piercing or for engraving the surface, and has many adaptations. In Fig. 2237, A is an apparatus for roughening sheet-glass. The air-blast is produced by the fan a below, and the air rises through the curved tube b, carrying the sand up with it, which is thrown into the air-tube by an endless belt of scoops arranged in the lower part of the angular box d. The sand is carried u