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 . to suit the size of the sheet to be this bar is fixed a short arm, with a pulley at, the enJ, which works round a wheel attached-^ to a cam with a dip. Every time the-SS--., pulley drops into the dip, the bar de- ^ scends upon the paper, which is laidir£i=»_J* marks at the front; and thepossessing a rotary mo-1 from the tapes, runssheet between a roller and a small d
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 . to suit the size of the sheet to be this bar is fixed a short arm, with a pulley at, the enJ, which works round a wheel attached-^ to a cam with a dip. Every time the-SS--., pulley drops into the dip, the bar de- ^ scends upon the paper, which is laidir£i=»_J* marks at the front; and thepossessing a rotary mo-1 from the tapes, runssheet between a roller and a small diiim on to the inner forme cylinder, as aiready kinds of machines are distinguished as the web, having aweb or a series of broad tapes which lie on the laying-on board andare fastened to a small drum underneath it. The drum has a seriesof small cogs, and when it is forced forward it moves the web ortapes in the same direction. The sheet, having been laid to aback mark on the tapes, is propelled betweentwo revolving rollers and thus taken into tliemachine. ^^P^^v^\^Bt There are several distinct types of per-fecting presses in use, but we can only ^^assigifi!notice one or two. In the Ai.;Ij- ^^iw^^i. 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 she
Size: 2179px × 1147px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
