Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . the presscomplete* the printing, and the sheet is then cut in two The Walters English press, which prints the London and theNew York Times, is shown in Fig. 3641. A r<)ll of paper n,three miles long, reels off over the pulley 6, which serves to keepit taut, and is damped in passing the cylinders c c. The wel)then passes over the cylinder (/ to the first type-
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . the presscomplete* the printing, and the sheet is then cut in two The Walters English press, which prints the London and theNew York Times, is shown in Fig. 3641. A r<)ll of paper n,three miles long, reels off over the pulley 6, which serves to keepit taut, and is damped in passing the cylinders c c. The wel)then passes over the cylinder (/ to the first type-cylinder e. be-tween which and the blanket-cylinder / it receives its first im-pression. Following the direction of the type-cylinder it p:issesbetween two lilotting-cylinders, and is than delivered lo the sec-ond printing-cylinder ?, receiving the impression at /i. It is thencut by a knife on the cylinder ( The sheets are finally piled onthe paper-boanls ic k. The speed of the Walter press is s:iid tobe 11,01111 printed slieets, or 22,000 impressions, per hour. The Bullock pi-ess, so named from the inventor, the lateWilliam Bullock of Philadelphia, carries the forms upon two PERFECTING-PKESS. 1667 PERFECTING-PKESS. Fig. Walter Press (London Times ). cylinders, requires no atteadaats to feed it, and delivers thesheet-! printed on both sides. The paper in the form of an endless roll is moistened by pass-ing through a shower of fine spray. A single roll will coutjiiaenough for several thuu-taud sheets, and the printing openition, ?including the cutting of the paper into proper lengtas, proceeds !uuiiiterrupteily until the roll is exhausted. The roll of piper having been mounted in its place, the ma-chinery is started, unwinds the paper,cuts off the required size,prints it on both sides at one operation, counts the number of ;sheets, and deposits them on the delivery-bo,ird at the rate ofeigjt thousand to fourteen thousiud per hour : or, countingboth sides, at the rate of s
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
