The exhibit of hydraulic-machine tools by Mr. R. H. Tweddell is a very admirable one, and shows a multitude of stationary and portable forms in which the idea is developed so as to reach the varying requirements. When work is more conveniently held to the machines, the latter are adapted to reach it whether presented vertically or horizontally, or with one arm inside of it, as with boilers and flue-pipes. When it is more convenient to handle the riveter, the latter is suspended from a crane and swung up to its work, and the peculiarity of the various sizes and shapes for different kinds of work is remarkable. The cut shows one of the latest for riveting girders. The Ingram rotary perfecting press, on which the _Illustrated London News_ is worked off, prints from a web of paper of the usual length, and is claimed as the final triumph in the line of inventors, which is thus stated in England: Nicholson, Koenig, Applegarth and Cowper, Hoe and Walter. We should be disposed to add a few names to the list, among which would be Bullock and Campbell. A is the roll of paper, containing a length of, say, two miles; B B the type and impression cylinders for printing the inner form; C C calendering rollers to remove the indentation of the inner form type; D D the outer form type and impression cylinders; E E cylinders with a saw-tooth knife and an indentation respectively to perforate the sheet between the papers; F F rollers to hold the sheet while the snatching-rollers G G, which run at an increased speed, break the paper off where it has been indented by E E. The folder is in duplicate to give time to work, as each only takes half the papers. The vibrating arm H delivers the sheets alternately to K and J, which are carrying-tapes leading to two folding-machines. If the sheets are not required to be folded, the arm H is moved to its highest position, and there fixed, without stopping the machine: it then delivers the sheets to the roller L, and by means of a blast of air and a flyer they are laid on a table provided for them.