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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
re of concrete. The marks of the boards which retained the semi-fluid matter in their construction are everywhere perfectly visible; and besides sand and gravel, there are large quantities of round bowlder-stones in the walls, from 4 to 6 inches in diameter, procured from the ground around the city, where they abound. Schroder's cement: coal-ashes, 100; hydraulic cement, 16; Portland cement, 1 part. Work in a pug-mill and mold. Cooley's: coarse pebbles, 60; rough sand, 25; lime, 15. Semple: pebbles, 80; rough sand, 40; lime, 10. Concrete-wall building. The mode of building concrete walls is indicated by the cut, in which the mass of mortar is held between facing walls of brick and inner boards, the latter being temporary. Con-crete′--press. A machine in which a mass of concrete is pressed into the form of a building block. The concrete is placed in the hopper m, and, when the slide n and the lower slide are withdrawn, drops into the box, which has divisional parti
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
to a repetition of the cutting operation. Soule's undercut machine has the knife below the bed, and the knife lifts with a shearing cut against a pile of paper held down on the bed by a clamp. The portion of the bed or table outside the knife is attached to the knife-carrier in such manner as to yield sufficiently to receive the part of the paper cut off. The knife moves only far enough to cut through the paper, instead of passing through its whole stroke, as in guillotine machines. Semple's paper-cutter (Fig. 3525) is used for trimming the folded edges of books and magazines after the sheets are stitched. Two bundles of books are placed on platform a with their backs to the standards e c, and are held down by the screw b. The platform is then drawn up the inclined track by the action of worm-gear e, and the sheets are brought against the knife d with a drawing cut. Platform a is pivoted to carrier f, and revolves to present the top, bottom, and sides of the books to the knif