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May, 1924 weight. Main bearings are six in number, 16.92 inches in diameter x 14.96 inches long. The center crank pin is 18.11 inches x 20.86 inches long. The side pins are 18.22 inches diameter x 10.89 inches long. The throw of both cranks is 4514 inches. The main pistons are of forged steel, with a cast iron skirt attached on the end away from the firing side, each skirt being fitted with two scraper rings. The distance the upper and lower pistons are apart when in_ their closest position is 9.44 Thus close clearances are eliminated. This favorable condition is a result of the high stroke-bore ratio adopted. The scavenging blowers supply 12,000 cubic feet of air per minute at 2 pounds pressure, though 1% pounds is usually used in service. The engines, so far built in this country have had connected scavenging pumps, but at the suggestion of W. B. Mayo, chief engi- neer of the Ford company, the independ- ent type was adopted with the approv- al of all concerned. An important fea- ture of these engines for lake service is that they can slow down to 15 revolu- tions per minute and can make their power for driving ship at 85 revolutions per minute. They can be reversed in four seconds. This is ell favorable in maneuvering. The absence of cylinder heads and air intake and exhaust valves which some past experience has shown to have been the cause of considerable trouble is evident in this design. ‘The auxiliary units to supply power for all the electric equipment’ are two 450 shaft horsepower Worthington 2- cycle solid injection type engines. These engines have six cylinders 1514 inches inches. MARINE REVIEW AFLOAT IN NA R- ROW SLIP AT - Loe RAIN. PLANT diameter x 16 inches stroke, revolutions 275 per minute. They have a mean effective of 37 pounds. The scavenging pump is contained direct in the engine. The generators which are direct-con- nected to these engines are Crocker- Wheeler 300-kilowatt, direct current, 230- volt machines. The following is a list of auxiliaries: Main engine fuel oil attached to main engine: auxiliary fuel oil, Sun Ship- building & Drydock Co., motor driven, 20-horsepower motor. ‘(oth oon i a Ii +51 Raa * 8 cot / nig ELECTRIC STEERING ENGINE, PLAN VIEW DRIVEN BY OILEN- GINES TEAS PRO- PELLER WILL DRIVE FORD FREIGHTER SEVERAL MILES FASTER PER HOUR THAN . USUAL: - LAKE PRACTICE 300-kilo- generators 2—450-horsepower diesel, watt, Crocker-Wheeler has attached fuel oil and also lub- ricating oil pumps. 2—Lubricating oil pumps for main engine, Viking rotary type. 1—Fuel oil transfer pump, Viking ro- tary type. 1—8% x 11 duplex power pump, driven by a 15-horsepower motor for main engine jacket water. 1—Centrifugal pump driven by a 20- horsepower motor for main engine jacket water. 1—Centrifugal pump driven by a 15- horsepower motor for jacket water cooler circulating water. 1—Centrifugal pump driven by a 7%- horsepower motor for _ cooling water to guides and to exhaust jacket. 1—Centrifugal pump driven by a 7%4- horsepower motor for cooling water to the two 450-horsepower auxiliary diesels, and diesels oil coolers circulating water. 1—Centrifugal pump driven by . horsepower motor for main engine auxiliary a4.5- lubricating oil cooler circulating water. 2—Double_ centrifugal main ballast pumps, driven by /75-horsepower motors, capacity 7000 gallons per minute each pump. 2—Centrifugal auxiliary ballast pumps driven by 30-horsepower motor, ca- pacity 2500 gallons per minute each pump. 1—Fire pump _ centrifugal 3-stage driven by a 25-horsepower motor. .2—Nash Hytor air pumps driven by