This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 Excerpt: ...cylinders turn in opposite directions, and thereby passing the sheet down the outsides of them. If the sheet passed down the inside of the second cylinder E, the printed side would be presented to the second form of type: but by passing it outside, the paper is really reversed, and the. unprinted side is presented to the type. It is difficult to explain this in words; but any one may see it clearly by taking a piece of paper and passing it over two rollers which are moving in different directions, in a similar manner to the printing cylinders. The printing machine exhibits some other beautiful contrivances for the regulation of its working; but it would be impossible to represent them in an engraving, and they must be seen to be understood. The speed of a single-cylinder machine is, on the average, about 1000 sheets an hour, and of a double cylinder machine about 750 sheets an hour printed on both sides. The speed, as we have said, is limited by the power of feeding the machine with paper, and few men can lay on more than 1250 sheets an hour. But a far greater speed has been attained by increasing the number of cylinders. For instance, Messrs. Applegath and Cowper constructed for the proprietors of The Times, a machine which may be considered four machines in one. It had four printing cylinders, four feeding places, and four places where the printed sheet was thrown out, and the speed attained was 4000 impressions an hour. But even this speed has been outstripped. The circulation of The Times, the name of which is inseparably connected with the progress of printing, has grown so large, that it became necessary to print it quicker than ever. The proprietors had recourse to Mr. Applegath, an engineer, who had previously done more than any other person for the...