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December,: 1926 TRE freighter, EL COSTON, owned by the Southern Pacific Co., measures 445 ft. over all, by 57 ft. beam and 37 ft. 6 in. depth. The De Laval marine im- pulse steam turbine and the De Laval double reduction gears which develop 7,100 shaft HP.. drive the propeller at 85 RPM. THE EL OCEANO, a fast freighter of the Southern Pacific Company built by the Federal Shipbuilding Company, is propelled by a 6000 HP. De Laval compound turbine and double reduction gears and was designed for a speed of 14% knots. The first round trip was made at an average speed of 15 45 knots. Steam is generated at 250 Ibs gage and 100 deg F superheat by oil fired water tube boilers. HE BOSTON and NEW YORK, built by Bethlehem Shipbuilding Corporation for Eastern Steamship Lines, Inc., have twin screws each driven through 3800 HP. De Laval reduction gears. ‘THE ORIZABA and SIBONEY. built by the William Cramp & Son Ship & Engine Building Co., for the Ward Line, were taken over by the government and completed as troop ships early in 1918, and after carrying nearly 60,000 troops to France and back again, were returned to their original owners. The De Laval Gears originally installed were found to be in perfect condition, al- though the ORIZABA has travelled over 560,000 miles, and the SIBONEY 550,650 miles. The turbines were designed to develop 4500 HP on each of the twin screws, driving the latter at 120 RPM., and giving a speed of 17 knots, although much higher speeds have been made in service. MARINE REVIEW EAc# of the propellers of the MALOLO | is driven by a 12,500 HP. compound steam turbine through two De Laval two pinion, single reduction gears giving a propeller speed of 120 RPM. These are the largest marine gears yet built in this country, the pitch diameter being 141 inches and the total width of the working face 57 inches. “The Most Modern Ships Have - De Laval Turbines and Gears Te ships illustrated herewith are representa- tive of over 3,000,000 HP. of De Lavel equip- ment in passenger and cargo ships, oil tankers, battle ships, destroyers and scout cruisers. They have proven themselves to be most economical and satisfactory in meeting the practical require- ments of service. Complete estimates on power plants for proposed vessels, including performance to be expected, supplied upon request. De Laval Steam Turbine Co. Trenton ,New Jersey TRE TRENTON, shown above, is one of five U S. scout cruisers, namely, RICHMOND, TREN- TON. MEMPHIS, MARBLEHEAD and CONCORD, each having four De Laval two pinion gears At the designed speed of 35 knots each gear transmits 22,500 HP That these gears have performed most satisfactorily 1s indicated Py the following paragraph from MARINE ENGINEERING for January. 1926 “72,000 miles without a major breakdown ts the enviable record made by the light cruiser TRENTON in the year and a half since she was commissioned The vessel recently arrived at the Philadelphia Navy Yard, where she ts to be fitted out as the flagship of the Light Cruiser Force, Scouting Fleet She 1s the last of the light cruisers built by the Wit!ham Cramp & Sons Ship and Engine Butiding Co, and has proved by this hard practical service that she is ready to take her piace reliably and effectively in the battle-line of the United States Fleet. During these cruises, which in the number of miles covered are the equivalent of almost three round-the-world ersises, the TRENTON has steamed from the Arctic to Australia and from Persia to Hawan.”* Please mention MARINE REVIEW when writing to Advertisers 43