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254 MARINE REVIEW SCOUL CRUISER: DETROLD ON TRIAL: 4RIP Scou Cruiser Detroit Shows Speed on Trial The U. S. scout cruiser Detroit, which has just completed exhaustive trials off the coast of Maine, has established a record by developing the highest power ever attained by any vessel constructed in the United States. The Derrorr was built for the United States navy by the Bethlehem Ship- building Corp. Ltd., at its Fore River plant, Quincy, Mass. The Derroir is im effect a fast and powerful destroyer, having a length of 555 feet, a breadth of 55 feet and a normal load displacement of 7200 tons. She carries twelve 6-inch rapid fire guns of the latest model four 3-inch anti-aircraft guns cap- able of firing into the air at any angle up to 90 degrees, ten torpedo tubes fitted to fire the latest model 21-inch long range torpedoes, and more than two hundred mines which can be launched over her stern and laid in a few minutes while run- ning at full speed. The vessel is fitted to carry airplanes which can be launched from revolving cat- apults while running with, against or across the wind; also with high power radio apparatus, wireless telephones, sub- marine signalling apparatus, electric steer- ing gear, laundry, workshop, hospital, etc ; in fact, she is in all respects the last word is design, construction, equipment and arm- ament that lessons of the late world war have shown to be essential for carrying out duty to which she would be assigned. Power for lighting the vessel and for operating the searchlights, wireless and various other electric-driven auxiliaries is generated by four 100-kilowatt turbo-gen- erator sets. The propelling machinery of the De- TROIT, designed and constructed through- out by the Bethlehem corporation, devel- oped 100,000 shaft horsepower on trials, which is sufficient to drive the vessel through the seas at a speed of 35 knots, or nearly 41 land miles per hour. This speed would take the vessel from New York to Liverpool in 80 hours as compared with about 120 hours required for the fastest passenger liner now afloat. Describing briefly the main propelling machinery, the vessel is fitted with 12 oil- fired water tube express type boilers, three being located in each of the four watertight compartments, and _ operated under forced draft. There are two water- tight engine room compartments amidships in which are located the 12 powerful Cur- tis-type marine steam turbines. These turbines operate at a speed of 2500 revo- lutions per minute which is reduced through reduction gears on each of the four propeller shafts, to 400 revolutions per minute. Excellent economy is obtained in connection with the oil fuel. Some idea of the enormous power and capacity ‘of the propulsion machinery in- stalled on the Detroir may be obtained from the following figures: At full speed, the shaft horsepower de- veloped is approximately three times as much as fitted to the recent battleships. Oil fuel is consumed at full speed at the rate of 100,000 pounds per hour, which requires 624,000 cubic feet of air per min- ute to effect combustion. The 12 express type boilers contain 65 miles of steel tubes, in which steam is generated at the rate of 1,500,000 pounds per hour at a pressure of 265 pounds per square inch. The main turbines are fitted with ap- proximately 32,000 blades, some of which July, 1923 rotate at a speed of eight miles per minute. Four main condensers, located in the engine rooms, require about 70,000,000 pounds of sea water per hour to condense the 1,200,000 pounds of exhaust steam from the main turbines. Ae Susans Several : Pacific Vessels Launched in May Sustained activity is apparent at the Seattle plant of the Todd Dry Docks, Inc., this spring having been the most active in recent years. Work at this yard has been temporarily interrupted by the strike of metal trades workers but, notwithstanding, several large jobs have been under way. This plant re- cently delivered fhe steel steamer SAGa- pAHOc on which about $200,000 was spent in rehabilitation after the tercoastal carrier had been ashore in Puget sound waters. The diesel-electric credge TrExas, built of wood at the Portland, Oreg., ship- yards was launched for the Long-Bell Lumbér Co. on May 14. This dredge is said to be the only one of the kind in existence. It is equipped with 525 horsepower and will operate a 15-inch pipe line. At the Vancouver, B. C., shipyards, the motor tug Werkspoor, 85 feet in length, has been launched. The first halibut fishing vessel built in Puget sound waters in several years was launched at Seattle May 18. This schooner is the RApto, bui't of wood and powered with a 100-horsepower gas engine. The Supple & Martin Shipbuilding Co., Portland, Oreg., has been awarded the contract for constructing a $65,000 wood stern wheel river steamer for the Ore- gon-Washington railroad. This vessel will be used in general freighting on the upper Columbia river. The Wood ferryboat Wuuipsy was launched at the Martinolich yards, near Tacoma, Wash., on May 6. This ves- sel will be used in Puget sound waters and has capacity for 400 passengers and 35 automobiles. The Wuupsy is 122 feet in length with beam of 33 feet. Triple expansion steam engines will sup- ply the power. in- Part of the former Standifer ship- building plant at Vancouver, Wash., has been leased to a firm manufactur- ing terra cotta and other building ma- terials. The Halifax & Newfoundland Steam- ship Co., shipping and general freight, Boston, has been incorporated for $75,- 000 by William D. Vanderbilt, Alfred H. Post and Sidney Hoey, Boston; Eugene P. Carver, Jr., Brookline, Mass., and Frank H. Chipman, Cambridge, Mass.