. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . unning quite clearinto the funnel of No, 2 cylinder. The valve T at the bottom of No. 1 cylinder is now opened,allowing the emery and water to fall into a vessel placed beneath to receive it ; and as soon as thestream of water is again running through all the cylinders and passing away at the overflow, moreemery is again sprinkled into No. 1 funnel. The succeeding cylinders are emptied in the sameway, as they respectively become filled with the finer sorts
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . unning quite clearinto the funnel of No, 2 cylinder. The valve T at the bottom of No. 1 cylinder is now opened,allowing the emery and water to fall into a vessel placed beneath to receive it ; and as soon as thestream of water is again running through all the cylinders and passing away at the overflow, moreemery is again sprinkled into No. 1 funnel. The succeeding cylinders are emptied in the sameway, as they respectively become filled with the finer sorts of emery. The beauty of this process isthe simplicity of apparatus required, and the certainty of always obtaining an exact repetition ofthe several degrees of fineness in the respective cylinders. It will be observed that, in consequenceof the cylinders increasing successively in capacity, the current of water ascending in the annular GLASS MACHINERY. 1677 spaces decreases in velocity in the same proportion ; consequently, tlie emery deposited in eachsuccessive cylinder ulereases in fineness over that deposited in the previoys The polishing benches have two bars carrying the polishing blocks, and working lengthwaysbackwards and forwards over the table on which the sheet of glass is laid, which is made to travelalternately from side to side, transversely to the bars. The polishing blocks are worked at aboutsixty double strokes per minute, and the bars carrying them are supported upon rollers at a heightof 6 or 8 in. above the table. The moving table is worked similarly to the table of a planingmachine, moving one way quicker than the other by a reversing motion similar to that of a planing-machine bed. It is generally considered that to obtain a good polished surface the polishing blocksshould not pass twice in succession over the same surface. Upon the moving table are fastenedslabs made of a wooden frame covered with slates, upon which the sheets of glass to be polished
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
