. A short history of the printing press and of the improvements in printing machinery from the time of Gutenberg up to the present day . ays between, the impression cylinder and the type cylinder, thusobtaining sheets printed upon one side. The impression cylinderdelivered them, still in a vertical position, into the hands of boys,one stationed at each cylinder to receive them. The results ob-tained from this machine were in a measure satisfactory, as thenumber of papers printed per hour upon one side, from one formof type, was materially increased; not, however, in proportionto the number of
. A short history of the printing press and of the improvements in printing machinery from the time of Gutenberg up to the present day . ays between, the impression cylinder and the type cylinder, thusobtaining sheets printed upon one side. The impression cylinderdelivered them, still in a vertical position, into the hands of boys,one stationed at each cylinder to receive them. The results ob-tained from this machine were in a measure satisfactory, as thenumber of papers printed per hour upon one side, from one formof type, was materially increased; not, however, in proportionto the number of impression cylinders placed around it, as thepress at its best could produce but 8,000 impressions per hour,on one side of the sheets. Having devised no means to lockup the type other than in flat columns, the polygonal form wasa necessity, and the irregularities in it were made up by under-laying the blankets on the impression cylinders to take up theseinequalities. Although this press, used in the London Timesoffice, was the only one of the kind ever made, its size andimportance warrant some record and description of it. This 38. 39 BULLOCK PRESS machine was taken out to make way for Hoe Type RevolvingPresses. In 1835 Sir Rowland Hill had suggested the possibilities of amachine which should print both sides at once from a roll of is well known that for many years cotton cloths had been printedin this way, the cylinders being engraved and the cloth after print-ing being reeled up again. The suggestion, however, was accom-panied by no practical knowledge as to the details, and, above all, nopractical provision for the rapid cutting off and delivery of thepaper either before or after it had been printed. It remained for anAmerican, William Bullock, of Philadelphia, to construct, in 1865,the first printing machine to print from a continuous web or roll ofpaper. His machine consisted of two pairs of cylinders, i. e., two formor plate cylinders and two impression cylinders
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