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© S PRESIDENT. HOOVER is fitted with four Babcock & Wilcox Cuyama burners for burning oil fuel under cold forced draft. The boilers are especially insulated for the conservation of heat. They are fitted with Babcock & Wilcox automatic feed regulators and Diamond soot blowers. The uptakes from all twelve boilers connect to the forward stack, the after stack being used for ventilation. The drums of the three forward and three after boilers are fitted with coils for desuperheating the steam required for the saturated steam aux- iliaries. Three Griscom-Russell fuel oil heaters are fitted in each boiler room, two of which have sufficient capacity to heat the total amount of oil which will be burned at full power in one boiler room. There is one Quimby horizontal motor driven fuel oil pump in each. fire room capable of supplying the oil burned at full power in one fire room. Two Warren steam driven vertical simplex pumps are supplied as stand-bys. Air is delivered to the burner fronts through ducts on the open fire room system by Sturtevant motor driven ‘‘Silent-vane”’ fans. Main and Auxiliary Condensers E condensate is drawn from the main con- densers by a condensate pump which dis- charges through the air ejector condensers to the feed tank. All the latent heat of ejector steam is thus conserved, no raw water pass being fitted. There are two Warren three stage centrifugal main feed pumps each driven by a Terry turbine. Each main feed pump has suffi- cient capacity to supply all the boilers at full power. There are also three Warren independ- ent steam driven vertical simplex auxiliary feed pumps, one in the engine room and one in each fire room. The feed pumps draw from the feed tank and discharge through two Davis heaters arranged in series and having sufficient capacity to heat the feed water to 300 degrees Fahr. The first One of the Two Main Shaft Thrust Bearings stage heater utilizes the exhaust from the steam driven non-condensing auxiliaries, augmented by steam bled from the eighth stage of the main turbines. Steam for the second stage heater is bled from the third stage of the main turbines. . Each main generator turbine is served by a 14,000-square feet two pass surface condenser located immediately below the turbine. The condensers are supported on flexible beams so designed as to insure protection for the tur- bines from undue stresses due to the weight or vertical expansion of the condensers. Circulat- ing water is supplied to each condenser by two motor driven Warren single stage centrifugal pumps each having a capacity of 10,000 gal- lons per minute. Each condenser is served by two two-stage sets of Westinghouse air ejec- tors mounted on a combined inter-and-after condenser. Each ejector set has sufficient ca- pacity to remove the air from the condenser which it serves when the propelling machinery is developing full power, the other set being used for a spare or in case of abnormal air leakage. Three Warren 250 gallon per min- ute motor driven centrifugal main condensate pumps are fitted, one pump serving each con- denser and the third pump being used as a stand-by. The duplication of the main circulat- ing pumps and air ejectors, and the spare con- densate pump, reduce to a minimum the liabil- ity of failure of the condensing plant. The auxiliary condensing plant is in general similar to the main plant. In order to insure uninterrupted service for the auxiliary gener- ators, which are of course vital to the operation of the main machinery, two condensers are pro- vided, one serving the forward pair and one the after pair of the 500-kilowatt generator tur- bines. One 3600 gallons per minute Warren Single stage centrifugal motor driven circula- tion pump serves each condenser. Twin West- inghouse air ejectors with inter-and-after con- densers are fitted, similar to the main plant. Three 50 gallons per minute Warren motor driven centrifugal condensate pumps are fitted, one to serve each condenser, the third being a stand-by. Four Auxiliary Generating Units A of the motors for the above auxiliaries, as well as practically all motors through- out the ship are of General Electric Co. make. The propellers are of the built up type 18 feet 6 inches in diameter, each having three manganese bronze blades and a semi-steel hub. The blade sections are of the standard ogival shape. The auxiliary generating plant consists of four steam turbines rated at 500 kilowatts, 4779 revolutions per minute, 5 stages connect- 34 MARINE REVIEw—Auegust, 1931