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"THE. MARINE. REVIEW 23 head working on a bar guide. The framing of the engines is of the open type, each engine having ten finished wrought-steel columns, with tie rods. The engine bed- plates are of cast-iron, supported on foundations built up from the frames of the vessel. The crank, line, and pro- peller shafts are forged of steel, and are solid, except the crank pins, which have a _ two-inch hole bored. through them. There is one condenser, of the cylindrical located in the engine room compartment, and are as fol- lows: One independent circulating pump, of the centrifu- gal type, for the main condenser, fitted to take water from the sea or the bilges, and delivered through the condenser or outboard. One independent main feed pump fitted to take water from the filter and feed tanks and discharge to the main feed pipe, and one independent auxiliary feed pump fitted pe MARINE REVIEW MARINE REVIEW REVIEW ARRANGEMENT OF ENGINES OF REVENUE CUTTER NO. I5. "type, placed athwartship in the after part of the engine room. It has 858 seamless drawn composition tubes, 5£-in. diameter, giving a cooling surface of 840 sq. ft. There is one ve:tical, single-acting, air pump, 13 in. in diameter, and of 7-in. stroke, attached to each engine, and worked by. beams from the low-pressure engine crossheads. There are two single-acting feed pumps, 134 in. diame- ter and 7-in. stroke attached to the port engine; and two single-acting bilge pumps, 134-in. diameter and 7-in stroke, attached to the starboard engine, all worked by arms from the air pump rock shafts. All the pumps are to take water from the filter and feed tanks, the bilges, the sea, from a suction hose, or the condenser, and dis- charge into the auxiliary feed pipe, the fire main, overboard, to the salt water side of condenser, or to the feed tanks. Two injectors to feed the boilers are located in the engine room. | se One independent bilge pump fitted to take water from the bilges or the sea, and to discharge overboard or into the flushing system. One air compressing pump to main- tain a pressure in the pressure tank for the water used in the various staterooms and lavatories. One evaporator