printing machine

A name in England for a machine for taking impre ions on paper from type, electrotype, or stereotype forms, steel or copper plates, lithographic stones, ., and which in this country is termed a printing pre (q.v.). It is moved by hand, or by steam, or other power. The impre ion from the forms is generally effected by cylindrical pre ure. Letterpre printing machines are of three kinds: (1) Single cylinder, by which the sheet of paper is printed on one side only; (2) Perfecting, which prints both sides of the sheet one operation; and (3) Platen, which prints one side of the sheet by flat, instead of cylindrical, pre ure. There are also various kinds of Rotary machines used for printing newspapers, into which the paper is drawn from reels, instead of being fed by single sheets. The first cylinder print ing machine was patented by W. Nicholson in 1790. The invention of steam printing pre es rendered books and periodicals so cheap that the progre of knowledge was amazingly accelerated; and soon the capacity of the cylinder pre proved unequal to the work of printing the enormous editions of some of the leading newspapers of the world; and the first succe ful invention to meet the exigency was made by Col. Richard M. Hoe, of New York, in the Type Revolving Printing Machine. It is, as its name indicates, on the rotary principle. The Hoe Perfecting Pre with folding machine comoined soon C. As substantive: 1. The act, proce , or practice of impre ing let ters, characters, or figures on paper, cloth, or other material; the busine of a printer; typography. There are several branches of the art, as, the print ing of books, ., by means of movable types; the printing of engraved steel or copper plates [ENGRAVING]; the taking impre ions from stone [LITHOGRAPHY], and the printing of figured pat terns on fabrics [CALICO-PRINTING]. Letterpre printing, or the method of taking impre ions from type or letters, and other characters cut or cast in ders over which hangs the roll of paper consists of one stereotype and one impre ion cylinder, and by it the first side of the paper is printed, The second pair, printing the second side, consists likewise of one stereotype and one impre ion cylinder, but the latter is below the former and is of much greater size, so that the" set off" from the fresh ink shall not fall continuously on the same surface of blanket. There is a third pair of cylinders which cuts off the sheet, and a fourth (in which, however, one cylinder is replaced by a brace of rollers), gives the first fold and shoots the doubled sheet in the circular cutter, which slits it into two papers, sending them be folded again separately and delivered prior pri'-ōn, s. [Gr. priōn =a saw.) Ornith.: Blue petrels; a genus of Pro cellar i i dae (q. v.), with five species, from the South Temper at a and Antarctic regions. ( Wallace .) Prion is a much specialized form, and has a broad beak, with a fringe of lamelle. pri-on-, pri-on-1-, pref. [PRION.] Serrated. pri-on-I-, pref. [PRION.]