. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . horizontaltable ; the bottom edge of the cylinder is introduced between the jaws of the small cutting instru-ment I, and the movable jaw carrying the cutting diamond is pressed by a spring against theinterior surface of the cylinder; then by gently pushing the instrument forwards round thecylinder, allowing it to run freely upon its wheels, the end of the cylinder is cut off perfectly cylinder then requires splitting longitudinally, which is accomp
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . horizontaltable ; the bottom edge of the cylinder is introduced between the jaws of the small cutting instru-ment I, and the movable jaw carrying the cutting diamond is pressed by a spring against theinterior surface of the cylinder; then by gently pushing the instrument forwards round thecylinder, allowing it to run freely upon its wheels, the end of the cylinder is cut off perfectly cylinder then requires splitting longitudinally, which is accomplished by placing it in a hori-zontal position in a wooden cradle, as shown in Fig. 3255, and a diamond fixed in the cleft of astick at J is drawn along inside the cylinder from end to end, guided by the straight-edge K, agentle pressure being exerted on the glass in opposite directions, at the diamond cut, to completethe splitting. The cylinder is now taken to the flattening kiln, Fig. 3256, which consists of two furnaces builttogether, the first, L, for flattening, and the other, M, for annealing, the former being maintained at a much higher temperature than the latter. A portion of the bottom of the flattening kiln L,slightly larger than the largest sheet of glass to be flattened, is supported upon a carriage N, whichwith the flattened sheet is made to travel into the annealing kiln M, this plan being a very great 1676 GLASS MACHINEEY. improvement over the old method of pushing the flattened sheet whilst in a soft state. The mov-able bed N is either of clay or stone, and by careful work is made as true as possible ; upon this asheet of glass is first flattened and left there to flatten others upon, in order to obtain sheet glasswith as true a surface as possible. The split cylinder to be flattened is gradually introduced intothe flattening kiln, being placed first at O and then at P, and when sufliciently warmed is placedupon the glass bed N, with its split side upper
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
