. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ulcast-iron frame work, with their planes at right angles to each other, so that eachof them may, in succession, be brought to bear upon the face, top, and back of asquare prism of iron covered with cloth, and fitted to revolve upon an axis between thesaid blocks. The calico passes between the prism and the engraved blocks, andreceives successive impressions from them as it is successively drawn through by awinding cylinder. The blocks are pressed against the calico through the agen
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ulcast-iron frame work, with their planes at right angles to each other, so that eachof them may, in succession, be brought to bear upon the face, top, and back of asquare prism of iron covered with cloth, and fitted to revolve upon an axis between thesaid blocks. The calico passes between the prism and the engraved blocks, andreceives successive impressions from them as it is successively drawn through by awinding cylinder. The blocks are pressed against the calico through the agency ofsprings, which imitate the elastic pressure of the workmans hand. Each block receivesa coat of colored paste from a woollen surface, smeared after every contact with amechanical brush. One man, with one or two children for superintending the color-giving surfaces, can turn ofi about 30 pieces English per day, in three colors, whichis the work of fully 20 men and 20 children in block printing by hand. It executessome styles of work to which the cyliader machine, without the surface roller, CALICO-PRINTING. 223 The copper-plate printing of calico is almost exactly the same as that used for printingengravings on paper from flat plates, and being nearly superseded by the next machine,need not be described. The cylinder printing machine consists, as its name imports, of an engraved coppercylinder, so mounted as to revolve against another cylinder lapped in woollen cloth, andimbued with a colored paste, from which it derives the means of communicatingcolored impressions to pieces of calico passed over it. Fig. 233will give the reader a general idea of this elegant and expe-• \ y^—-«.. I , ditious plan of printing. The pattern is engraved upon theW / \| I surface of a hollow cylinder of copper, or sometimes gun- metal, and the cylinder is forced by pressure upon a strongiron mandrel, which serves as its turning shaft. To facilitatethe transfer of the impressio
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
