The groundwork principle is the same as in other presses of this kind. The first pair of cylinders over which hangs the roll of paper consists of one type and one impression cylinder, and by it the first side of the paper is printed. The second pair, printing the second side, consists likewise of one type and one impression 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 on to be folded again separately and delivered in their respective places in piles at the side of the press; or the papers are rolled up exactly on the top of each other, six in number, and flown perfectly on the fly-board. This machine printed and folded at the rate of more than 28,000 sheets an hour at the Centennial Exhibition, printing and folding at one time two copies of the Philadelphia _Times_. It is already in use in a dozen newspaper establishments in various parts of the world. All these machines were in operation at the great Centennial Exhibition in Philadelphia. A fourth press exhibited,—claimed by its inventor, Mr. A. Campbell of New York, to be capable of printing much faster than any other,—was set up too late to prove its capacity by actual test. No press however, can be made more simple and with fewer parts than this. RAILROAD-TICKET PRINTING AND NUMBERING PRESS. These presses not only print, but at the same operation number consecutively, tickets and coupons of every size and pattern, which are also indented or cut apart by the machines as fast as printed. Ten local tickets twenty-six inches in length can be printed at one operation. The average rate of speed is about fourteen hundred impressions an hour,—equivalent to fourteen thousand tickets. JOB PRESSES. [Illustration: GORDON’S FRANKLIN PRESS.] The invention of machines for printing small work elegantly as well as swiftly is of vast advantage to the printer, and has greatly increased the jobbing department of typography. Here, as in other matters, American ingenuity has taken the lead of all nations; and the presses invented by Ruggles, Hoe, Gordon, Degener, Wells, and Gally,—not to mention numerous other inventors,—defy competition. The Ruggles presses formerly commanded the trade; but the beautiful machines of Geo. P. Gordon, a man of decided genius, and the presses of other makers above named, have entirely displaced them. Hoe’s half medium cylinder job press will run 2500 impressions an hour. [Illustration: NONPAREIL PRESS.]