The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . Fic. 13.—MariDOnl combined perfecting; and duplex niaeliiae. the intermediate drums for conveying the sheet from one cylinderto the other. The cylinders are on a level, but alternately rise and?all, allowing the sheet to clear the forme. Quite recently a single-Jylinder perfecting press has been invented. The cylinder is usual size and has two printin
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . Fic. 13.—MariDOnl combined perfecting; and duplex niaeliiae. the intermediate drums for conveying the sheet from one cylinderto the other. The cylinders are on a level, but alternately rise and?all, allowing the sheet to clear the forme. Quite recently a single-Jylinder perfecting press has been invented. The cylinder is usual size and has two printing surfaces and a double set ofjrippers. Two sheets are printed at each revolution, the first beingthe white paper and the second the partly printed sheet which hagimmediately preceded it. The sheet is fed in as to an ordinary singleside press, printed on one side, taken off, reversed, again gripped,and perfected, when it is automatically delivered on the table. It has been mentioned that250 sheets or a token per hour,printed on only, re-present the work of two men atthe hand-press. Two youthsat a perfecting machine willcomplete from 1200 to2000 copies per hour, ,.-**equal to 4000 im-pressions on. one side only,—an increase of about sixteenfold. This, however,does not represent the whole of the superiority of these mnch larger than double crown (20 x 30 inches) can hardlybe worked at a pre-ss ; the machine perfects a sheet nearly doublethis size—50 x 40 or four royal, so that the proportionate productof the machine to the press is about as 32 to 1. Perfecting machines are not so much used for book-work asformerly. The single-cylinder machine has been brought to suchperfection, and is so superior in its inking arrangements, thatprinters prefer it In America nearly all machines are newspapers of limited circulation, however, the perfectin^^machine is well adapted. Complete copies of a journal are producedas soon as the machine is starte
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Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
