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'MGTAOULSAG LOITANAG MAIA MOAG AGNV ATIMMOXd GaivOANI 06 L'mM G8 08 Ny oa ol OS im "LM GE CLM _OF LM TAE Marine. REVIEW 21 tion, new bids will be solicited. This de- stroyer, Revenue Cutter No. 17, will be - the largest vessel in the service, and of the following dimensions: Length over all, 204 ft. 10 in.; length between perpen- -- diculars, 188 ft.; breadth of molded beam, 34 ft.; depth at side from base line amid- ships, 25 ft. 9 ins. Displacement to mean load draft of 15 ft. 6 in. above base line, with 300 tons of coal and 26,500 gallons of water on board and ready for sea, 1,480 tons. The machinery installation will con- sist of one inverted-cylinder triple-expan- sion engine, having one high-pressure cylinder 20 in., one intermediate-pressure cylinder 32 in., and one low-pressure cyl- inder 52 in. in diameter. The stroke will be 36 in. The indicated horsepower of the main engines will be about 1,500 when making the maximum number of _ revolutions per minute. The main valves - will be of the piston type for the high- pressure, intermediate-pressure, and the low-pressure cylinders. All. will be -- worked by the Stephenson link motion, with double-bar links. The crank, line, and propeller shafts, piston rods and all \ working parts generally will be of mild open-hearth steel. The length of the crank shaft will be 17 ft. 9 in. over all, with pins and journals 10% in, in diam- eter. The thrust shaft will be forged in one section, 10% in. in diameter and about 8 ft. 8 in. long over all. The shaft will have nine thrust collars. The propeller shaft will be 11 in. in diam- eter, and will be completely encased in the tube, with a protective composition; the propeller to be right-handed, of man- ganese-bronze, with a diameter of 11 ft. 6 in, and of the built-up type. The main condenser will have a cooling sur- face of 2,092 sq. ft:, the circulating water being supplied by one independent cen- trifugal pump. There will be one at- tached air pump and two attached feed pumps, worked by beams from the low- pressure crosshead. There will be two single-ended boil- ers of the Scotch type, carrying a work- ing pressure of 180 lbs. per sq. in. The general dimensions will be: , Diameter of shell' (inside), 14 ft.; length over heads (bottom), 10 ft. 3 in.; number of furnaces, 3; diameter of furnaces (in- side), 42 in. Total grate surface, 63 sq. _ ft. Total heating surface, 1,930 sq. ft. Her auxiliary pumping machinery con- sists of one fire-and-wrecking pump of the vertical duplex type, one horizontal bilge pump of the double-acting simplex type, one auxiliary feed pump of vertical duplex type, an evaporator feed, distil- ler circulating and sanitary, and air com- pressing pump. Besides the attached air and feed pumps already mentioned, there are attached bilge pumps. _ There will be an evaporating and dis- ce Ee wee