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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
ippers. These are devices for tripping or casting loose a ship's anchor. In some of them it is suspended by its ring from the cat-block or a tripping-bolt; in others it is fastened at each end by chains which are cast loose simultaneously. Duncan's anchor-tripper. Duncan, April 28, 1863. The anchor hangs from a clutch-ring on the cat-block, which is suspended below the cathead. When the fall is cast loose, the block descends, and the clutch is opened by the chains which are attachedDuncan, April 28, 1863. The anchor hangs from a clutch-ring on the cat-block, which is suspended below the cathead. When the fall is cast loose, the block descends, and the clutch is opened by the chains which are attached to the cathead, and to the projecting levers or prongs on the respective halves of the clutch. A single motion, the slackening of the fall, operates the tripper; the clutch is opened when the chains are made taut by the descent of the block. Stacey, December 27, 1864. The anchor is suspended by its ring from the hook of the fallblock, which depends from the cat-head. The tripping-rope is attached to an eye on the fall-block hook, and is belayed to a pin on the cat-head. When the fall i
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
still more enlarged scale. The best working-angle for the frame is 45°. The dredging-machine used in excavating the South Boston flats has a scow 80 feet long, 40 wide, and a dredge-shovel and chain of elevating-buckets on each side. They are advanced by chains running to anchored scows, the shovel beneath each elevator raising the mud and silt, and the buckets elevating the scooped — up mass, which is deposited in a scow attached to the dredger. Dredging-machines, Suez canal. Duncan's dredger, used on the Clyde in Scotland, has an iron hull 161 feet long, 29 feet beam, 10 feet 9 inches depth; has water-tight compartments, engine-room, and quarters for the crew. It has one bucket-chain, thirty-nine buckets having a capacity of 13 cubic feet each; driven by gearing from a marine engine of 75 nominal horse-power. It is moved forward by a steam-winch and a chain to a mooring. Sixty dredging-machines have been at work at one time in excavating the Suez Canal. They are
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
Explicit notice is deferred for reasons explained farther on. Fig. 4854. Pratt's running-stitch machine. Next in order of date, making the chain-stitch, is Duncan's machine, English. No. 2,769, of 1804. It had a number of hooked needles, which passed through the cloth, then each was supplied with thread by a feeding-nee,740RyderMar. 14, 1871. 113,135Bishop et al.Mar. 28, 1871. 115,060JonesMay 23, 1871. 115,779Stafford et al.June 6, 1871. 116,040FontayneJune 20, 1871. 118,117DuncanAug. 15, 1871. 119,606HatchOct. 3, 1871. 120,098ProctorOct. 17, 1871. 120,783SkinnerNov. 7, 1871. 124,106WrightFeb. 27, 1872. 127,571ClarkJune 4, 1872. 128,1t-iron bars. The mangers for grain, of which three different patterns are shown, have iron flanges, to prevent the horse from cribbing. See also stable. And Duncan's horses, Beauteous and swift, the minions of their race, Turned wild in nature, broke their stalls, flung out. Stall-boards. A series of floors on to whic