. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. adrant. The slide-valve is also opened immediately by thequadrant, whenever the rudder is driven amidships by the excessive strain of a heavy sea, and itthus gives a double relief to the water at that moment; but the quadrant closes the valve again onthe rudder returning to the position from which it was disturbed. The shaft N of the steering HYDRAULICS. 745 tiller has a tubular casing, wMch is fixed to the quadrant below, and is carried up to the top of thesteering pedestal, and a pointer P is keyed upon
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. adrant. The slide-valve is also opened immediately by thequadrant, whenever the rudder is driven amidships by the excessive strain of a heavy sea, and itthus gives a double relief to the water at that moment; but the quadrant closes the valve again onthe rudder returning to the position from which it was disturbed. The shaft N of the steering HYDRAULICS. 745 tiller has a tubular casing, wMch is fixed to the quadrant below, and is carried up to the top of thesteering pedestal, and a pointer P is keyed upon it, which travels over a graduated arc and indicatesthe position of the rudder, as in the plan, Fig. 1449. In this way any angle at which the steeringtiller L is placed, will be followed by a corresponding angular position of the rudder, and this isindicated at once by the small pointer P. The working of this apparatus is perfectly smooth and noiseless, in consequence principally ofthe circumstance that no cog wheels are employed. Also the slide-valve required is so small, that with a steering tiller of 3 ft. in length, it is found so little power is required to move it that a boycould easily steer. The hydraulic winch is shown in Figs. 1452 to 1456. Two winding barrels A A, with their breaks,are mounted in the frames B B, Fig. 1452, the outer ends of their shafts having warping ends 0 0keyed on. The wioch is driven by the rams, 3J in. diameter, of three oscillating hydraulic cylin-ders D, which act upon the same crank pin, Fig, 1453, and they receive and exhaust their waterthrough the trunnions, by means of partially balanced cylindrical slide-valves E, Figs. 1454 to 1456,the casing of which remains stationary, whilst the cylindrical valve or plug E, moves with the oscil-lation of the cylinder. When this hoist is required to discharge light cargo, such as tea or grain, fourropes can be worked out of one hold, the engines constantly running at 30 revolutions a minute; an
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
