. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. the an^le subtended by A, B, C, is an entire revolution of a screw 15 feet 6 inches'diameter, and 23 feet pitch, of which B D is the forward effort com- municated to the vessel, and C D is the slip, or welding of water Conse- oaentlv, although the apparent angle of tlie screw is represented hy A B C, the re'al angle is only A C D, since A B D represents the velocity of the vessel. The steam-engine employed to drive this screw, consists of four steam cylinders, each of 88 inch


. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. the an^le subtended by A, B, C, is an entire revolution of a screw 15 feet 6 inches'diameter, and 23 feet pitch, of which B D is the forward effort com- municated to the vessel, and C D is the slip, or welding of water Conse- oaentlv, although the apparent angle of tlie screw is represented hy A B C, the re'al angle is only A C D, since A B D represents the velocity of the vessel. The steam-engine employed to drive this screw, consists of four steam cylinders, each of 88 inches in diameter, hy 6 feet stroke, into which steam is admitted by of 20 inches in diameter. As it is very troublesome to lift large piston covers, inanlioles are made in them, and in the pistons, so that the bottoms of the cylinders can he easily examined. The large diameter given to the steam cylinders was purposely with a view to working verv expansively, and on the trial recorded, the steam, being at 4 lbs. pressure "in the boiler, was throttled on its passage, and cut oft by the expansion-valve at Jth of the stroke, that is, 1 foot from its commencement. The connecting rods of these engines are applied in pairs to crank pins, at either end of the main shaft, and the same crank pin carries the connecting rod of one air-pump, of the same lenglh of stroke by 45 J inches in diameter. This air-pump is inserted in the wrought iron condenser, which receives the steam from the cylinders. Tlie main shaft is of wrought iron, 1/ feet long, hy 28 inches in diameter, in the centre, and 24 inches in the bearings which are 30 inches long; through this shaft, as through the cranks and crank pins, a hole is bored, and a stream of cold water is constantly injected, which has an important influence in keeping the bearings cool. Upon this main shaft, is a tocthed drum, of 18 feet in diameter, with a face 38 inches in width, around which, and a lesser drum of 6 feet in diame


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Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience