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rotor is mounted on the forward end of the outboard pinion shaft. The astern rotor is mounted on the aft end of the outboard pinion shaft. Both pinions mesh with the same high speed gear and are placed on an an- gle of 45 degrees to the centerline of the gear. Steam for ahead power passes through the high pressure ahead turbine, then the intermediate pressure turbine, then the low pres- sure turbine and thence to the con- denser. The astern turbine exhausts directly into the condenser; there- fore when operating ahead, the astern turbine rotor revolves in a vacuum and vice versa. When operating with steam at 385- pounds pressure at the throttle, 200 degrees Fahrenheit superheat and ex- hausting at 27 inches vacuum, the ahead turbines will develop 800 shaft horsepower on each propeller shaft running at 250 revolutions per min- ute. With the same steam conditions, each astern turbine will develop 65 per cent of ahead power when op- erating astern at approximately 7000 revolutions per minute. The normal full speed of the turbines is 6979 rev- olutions per minute which gives a propeller speed of 250 revolutions. The steam generating units have boilers of the two-drum type equipped with soot blowers and are baffled to provide for two pass travel of the gases. Hach boiler contains two banks of tubes of 1 inch diameter each and the first row of the lower banks which are 2 inches in diam- eter. With the exception of a small front refractory wall in which two oil burners are set, the furnace is en- tirely water cooled with tubes of the fin type. The furnace volume of 400 cubic feet permits a heat liberation of 31,- 000 Btu. per cubic feet per hour when the unit is generating at the rate of 10,000 pounds of steam per hour. Both the side and rear wall fur- hace tubes are 3 inches outside diam- eter with l-inch fins. The centerline spacing of the tubes is 5% inches. A radiant type Foster Wheeler su- perheater is located’ in front of the tubes forming the rear furnace wall, the superheater elements connecting to headers outside the wall at the up- ber and lower points. The elements pass between the fin tubes into the furnace to a point 9 inches in front of the wall tubes. The superheater elements are a special alloy material to withstand the high temperatures. The superheater is designed to pro- duce 200 degrees superheat at a steam Pressure of 425 pounds. Immediately above the upper row of the top bank of boiler tubes is the economizer, which is designed to raise the water temperature from 212 de- ay Fahr. to 275 degrees at the 10,- 00-pounds evaporation rate. hp feed pumps are turbine driven 2 Weal three stage centrifugal type tking at full boiler pressure and Pounds per square inch back pres- Ford Canal Freighter Edgewater—Sliding Steel Hatch Covers sure. They have a water capacity of 60 gallons per minute at 550 pounds per square inch. The feed water heater is a 120 square-foot Westing- house type capable of raising the feed water to 230 degrees Fahr. built for a working pressure of 550 pounds per square inch. Induced draft is furnished by two turbine driven propeller type fans operated at full boiler pressure, pro- viding 20,000 pounds of gas per hour at 500 degrees Fahr. against 3% inches static pressure. A Copes feed water regulator is fitted to each boiler as well as a Smoot control to regulate the fuel oil and induced draft. The vessel is equipped with four Johnson-Jett automatic tension winch- es for handling in the locks, each driven by a 20-horsepower motor. The steering gear, of Benson make, is of the transverse screw gear type sterom- * etor with motors in duplicate. This is controlled electrically from the pilot house and on deck aft of the pilot house. Each duplicate motor is 20 horsepower. Two Benson warping winches are located at the bow and stern driven by 10 horsepower compound wound mo- tors. These winches are used partic- ularly in the locks where the vessels have minimum clearances. The holds, three in number, are served by nine hatches with telescopic steel covers opened or closed by two motor-driven winches. Each hatch is 12 x 24 feet. Equipment in the pilot house con- sists of main engine controls, mag- netic and gyroscopic compasses, dual steering gear, telegraphs, controls for the hydraulic ram used to drop the stack, searchlight controls, a chart table and controls for lowering the pilot house. Main Engine and Boiler Rooms gS. §. Edgewater—Looking Aft MaRINE Review—October, 19 ot 27