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MARINE REVIEW. Oil Carrying Steamers. The illustration of triple expansion engines on this page is from Engineering of London, which has devoted considerable space in recent issues to a description of the oil carrying steamers Delaware and Lackawanna, built by David J. Dunlap & Co. of Port Glasgow for the Anglo-American Oil Company, Limited, the British corporation representing the Standard Oil Company. The vessels, which are each 345 feet long between perpendicu- lars, 44 feet beam and 31 feet 9 inches moulded depth, are spe- cially constructed for carrying oil in bulk, and there is embodied in them all the advantages derived from experience in the con- Nex attained, as it is customary, as soon as the forward tanks have been empfied of their oil, to commence filling them. 'This is the more likely course, as they are not infrequently refilled with sea water, which acts as ballast for the westward voyage. But even with this method of working, the whole cargo can be discharged and water ballast for the outward voyage pumped on board in from ten to twelve hours from the commencement of operations. This ship propelling machinery, illustrated herewith, con- sists of a set of triple expansion engines having three cylinders, 27 inches, 43% inches and 70 inches in diameter, respectively, with a stroke of 51 inches. 'The valve motion is of the usual ENGINES OF AN OIL-CARRYING STEAMER. struction of ships designed for the same trade in the past. The dead weight carrying capacity is 5,200 tons, 600 tons being allotted for coal, and the remaining 4,600 tons for the cargo of petroleum. ae The oil pumping plant, which is a feature in a steamer of this kind, was constructed by the Snow company, well known in this country. 'The main pumps, of which there are two, are of the usual duplex type, each having two steam and two water cylinders, 14 inches in diameter, with a stroke of 12 inches, and a maximum output of fully 500 tons per hour. Thus, with the two pumps running, 4,600 tons of oil may be discharged in a little over four hours. In practice, however, this will never be link type, and all valve centers are in line with the cylinders... Liners are fitted to the high pressure and medium pressure cylinders, as well as to all valve faces. Piston valves are fitted to the high pressure, "trick" to the medium pressure, and double- ported to the low pressure cylinders, all having large steam open- ings. Steam is supplied by two boilers, each 14 feet 6 inches in mean diameter, by 16 feet 9 inches long, constructed of Siemens- Martin steel for a working pressure of 160 pounds per square inch. 'here are altogether twelve furnaces, the flues being of the Purves form. 'The horse power developed after a series of trials was 2,686, at 7114 revolutions, 163 pounds steam and 2834 inches vacuum, and the speed 12.27 knots.