. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. 5 to 1 ; and the combined cubic capacity of these plungers is assumed to be at least equalto that required for a full stroke of the press ram, a certain margin being added to make up forleakage. It is clear therefore that the lifting ram of the press worked by this pumping apparatuswill rise five-sixths of its lift with one stroke of the plunger G, and that one stroke of the plungerH will complete the remaining one-sixth. The sizes of the steam pistons E and F being equal,if the pressure of steam be the sa
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. 5 to 1 ; and the combined cubic capacity of these plungers is assumed to be at least equalto that required for a full stroke of the press ram, a certain margin being added to make up forleakage. It is clear therefore that the lifting ram of the press worked by this pumping apparatuswill rise five-sixths of its lift with one stroke of the plunger G, and that one stroke of the plungerH will complete the remaining one-sixth. The sizes of the steam pistons E and F being equal,if the pressure of steam be the same on Iwth, the pressure per sq. in. on the water in the presswill be five times greater when the piston F is forcing water in tlian it will be when the piston Eis acting. Now assuming the pistons E and F to be home at the back ends of their cylinders, as inFig. 1479, and the press ram also to be at the bottom of its cylinder, it is evident that, ifthe pipes B and the hydraulic cylinders C and D are filled with water or other fluid practically isTeet incompressible, any movements of the pistons E and F will move the press ram ; and again, sup-posing that this ram, either by gravity or other means, is caused to return to the bottom of itscylinder, it is clear that the pistons E and F will also return to their former positions; thereforeno inlet or outlet valves whatever are required, the same water being forced for wards and backwardsbetween the press ram and the plungers G and H. The admission of steam to the pistons on theone hand, and the weight of the press ram and platen on the other, when the steam is exhausted,acting through the interposed water as a connection, produce the same effect as if the pistons andpress ram were mechanically connected together by a rigid coupling. Fig. 1480 is of a pressure-intensifying apparatus and cotton press in elevation, and Fig. 1479 thesame in part sectional plan. Fig. 1481 is a section of the valves P to U, and Fig. 1482 of the va
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
