. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . s not represent the whole of the superiority of these macliines. Sheets much larger tlian double crown (20 x 30 inches) can hardly bo worked at a press ; the machine perfects a sheet nearly double this size—50 x 40 or four royal, so that the proportionate product of the machine to the press is about as 32 to 1. Perfecting machines are not so much used far book-work as formerly. The single-cylinder machine has been brought to such perfection, and is so superior in its inking arrangements, that printers p
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . s not represent the whole of the superiority of these macliines. Sheets much larger tlian double crown (20 x 30 inches) can hardly bo worked at a press ; the machine perfects a sheet nearly double this size—50 x 40 or four royal, so that the proportionate product of the machine to the press is about as 32 to 1. Perfecting machines are not so much used far book-work as formerly. The single-cylinder machine has been brought to such perfection, and is so superior in its inking arrangements, that printers prefer it. In America nearly all machines are one-sided. ior newspapers of limited circulation, however, the perfecting machine is well adajited. Complete copies of a journal are producea as soon as the machine is started ; copies can be worked off while news agents are waiting ; and a number of sheets need not be printed off on one side to be completed when a sudden demand 13 shows a new form of French jierfecting machine for printing book - work, theI Maiinoni com-. Fio. 14.—Walter inachiDei 1)ined perfecting and duplex single-cylinder machine. The improva-?ment in this machine over the perfecting hvo-cylinder machine de-scribed above consists in the alteration of some mechanical parts, sothat the same machine can be used for printing sheets cither onboth sides or on one side only. It t!)crefore serves the purpose oftwo single-cylinder machines or of one perfecting machine, theajhange from on e to the other being very simple. The rotary press differs essentially from the cylinder the former the printing surface and the impressing surface bothrotate continuously, and the paper,—not cut up into single sheets,?Jmt carrvitl the twft cylinders in a roll or web, like a ribbon. —receives successively an impression on ca;h side, after which it iscut up into sheets of the proper size and folded as it is run out, thesheets being deposited
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Keywords: ., bookcentury1900, bookdecade1900, bookidencyclopaedi, bookyear1902
