. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Paddle- Wheel Engine.—Fig. 3 shows the engines of the Hygeia, a pad-dle-wheel steamer built on the Clyde in 1890. The Ilygeia is 300 ft. in length. 32 ft. beam,and 12 ft. in depth. The engines are constructed on Rankins patent • disconnective triple-expansion principle, especially designed for high-speed river-steamers. They are of the diag-onal direct-acting type, and have two high-pressure cylinders,
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Paddle- Wheel Engine.—Fig. 3 shows the engines of the Hygeia, a pad-dle-wheel steamer built on the Clyde in 1890. The Ilygeia is 300 ft. in length. 32 ft. beam,and 12 ft. in depth. The engines are constructed on Rankins patent • disconnective triple-expansion principle, especially designed for high-speed river-steamers. They are of the diag-onal direct-acting type, and have two high-pressure cylinders, each 28 in. in diameter, andplaced behind an intermediate and a low pressure cylinder 56 and 86 in. in diameter, respect-ively, with a piston-stroke of 66 in., working tandemwise, in connection with a double-throwshaft. There is only one pair of stuffing-boxes between each pair of cylinders, and amplespace has been provided for the easy removal of the intermediate and low pressure cylinder-covers, which, in addition, have been fitted with man-holes and doors for examining the pis-tons without disturbing the covers. All the pistons have deep cast-iron packing-rings held. Fig. 3.— engine. up to the bore of the cylinders by short spiral steel coils. The two high-pressure cylinder-valves are of the piston type, the intermediate being on the trick principle, and the low-press-ure is double-ported. The valve motion consists of the double-barred link type, and is actuatedby one of Browns steam and hydraulic reversing-engines, the starting lever for which, alongwith the lever for the throttle-valves, is brought to the main-deck platform, and constitutes a 280 EXGINES, MARINE. particularly simple arrangement, as, in consequence of there being two high-pressure cylin-ders, no starting-valves are required, and it is impossible fur the engines to stick on the dead-centers, so that prompthandling is always as-sured. The diagonal fram-ings liave been made ofwrought ir
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
