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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
l cement. Clegg's atmospheric Railway. An experimental line was laid down at Worm- wood Scrubs by Clegg and Samuda. The line was half a mile long, with a rise of 1 in 120 for a part of the distance and 1 in 115 for the remainder. The diameter of the main was nine inches. The exhaustion was produced by means of an air-pump 37 inches in diameter and 22 inches stroke, worked by a condensing engine of 16-horse power. This arrangement was employed from 1844 to 1855, on the line from Kingston to Dalkey, Ireland, 1 3/4 miles long. It is stated that an exhaustion of 15 inches could be produced in two minutes, and a rate of 50 to 60 miles an hour could be obtained. The rise is 71 1/2 feet in 3,050 yards. The diameter of the main was 15 inches. The double-acting air-pump was 66 1/2 inches diameter, with a stroke of 66 inches. It was worked by a high-pressure condensing-engine of 34 inches diameter and 66 inches stroke, working expansively. The stoppage was effected by a powe
Knight's Mechanical Encyclopedia (ed. Knight), K. (search)
oof. （Carpentry.) One having but one vertical post in each truss. King-rod. A tension rod depending from the ridge of a roof and uniting with the tie-rod; occupying the position of the king-post in wooden roofs. See King-post (A). Kingston's valve. A conical valve, forming the outlet of the blow-off pipe of a marine engine; it opens through the side of the vessel by turning a screw. Kingston's valve. King-truss. A roof or bridgetruss framed with a King-post (which seeKingston's valve. King-truss. A roof or bridgetruss framed with a King-post (which see). Kink. （Nautical.) A sharp bend in a rope or cable which prevents its reeving through a block or a hole. Kinsh. A crowbar used in quarrying. Kio-tome. （Surgical.) A knife for cutting membrane; especially certain pseudo-membraneous bands in the rectum and bladder. Kip. Leather of yearlings or small cattle. A grade between calf and cowhide. Kip-skin. Kirb. See curb. Kish. （Smelting.) a. A carburet of iron which, when cold, appears in bright shini
Knight's Mechanical Encyclopedia (ed. Knight), U. (search)
-valve. Foam-cock.Sweetening-cock. Folding-valve.Syringe-valve. Foot-valve.Tail-valve. Four-way cock.Test-cock. Gage-cock.Three-way cock. Globe-cock.Throttle valve. Globe-valve.Tidal valve. Governor-valve.Trap-valve. Grease-cock.Tripping-valve. Gridiron-valve.Trunnion-valve. Hanging-valve.Two-way cock. Hydrant-valve.Vacuum-valve. Hydraulic valve.Valve-bucket. Induction-valve.Valve-cock. Injection-valve.Valve-coupling. Internal safety valve.Valve-file. Key-valve.Valve-gear. Kingston's valve.Valve-motion. Lever-valve.Water-check. Lock — up safety-valve.Water-closet valve. Long-slide valve.Water-gate. Main check valve.Wicket. Measuring-faucet. The heart is constructed upon the principles of hydraulics, and is furnished with a valve. Harvey deduced the circulation of the blood from Aquapendente's discovery of the valves in the veins. Servetus, who was burnt at Geneva, 1553, was engaged in the search, and came near anticipating the theory which Harvey complete
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
bridge, by the same architect, on the arch principle, is shown in Fig. 7318, b. Each compartment corresponds to a voussoir in a masonry arch. These constructions enable short timbers to be used for a comparatively long span. The joints, however, cannot be made very strong, and tend to diminish the stability of the structure, so that it sooner gives way under the jarring strains to which it is exposed. Fig. 7319, d, shows one of the wooden arches, 49 feet in span, over the Thames, at Kingston. This approaches in form the continuous curved rib, which is, however, a more solid construction, being built up of pieces, arranged to break-joints, and bolted together, so as to act as a solid mass (Figs 312-316). This principle has been adopted in many bridges of considerable magnitude, both in Europe and America, among others that over the Regnitz, near Bomberg, designed by Wiebeking, and built in 1809 (e, Fig. 7319). The celebrated wooden bridge over the Rhine, at Schaffhausen, ere