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March, 1927 MARINE REVIEW Ly NEW YORK CENTRAL NO. 34 OIL ENGINE ELECTRIC TUG—AT LEFT—PILOT HOUSE—PROPULSION MOTOR IS OPERATED DIRECTLY BY THE CONTROL LEVERS ON THE PEDESTALS TO PORT AND STARBOARD—AT RIGHT—DOUBLE ARMATURE PROPULSION operating, approximately 80 per cent of the full speed of the tug is possible. “Due to time saved in fueling and in the elimination of the need for dis- posing of ashes and cleaning boilers, in the saving of time necessary to get up steam and in its ability to start and stop immediately, the oil- electric tug is in service a greater part of the time than is the case with the steam tug. “Because of its reduction of fuel costs, of its ability to be in service more frequently than the steam tug and the need for fewer operators, OIL ENGINE ELECTRIC INSTALLATION ON NEW YORK CENTRAL TUG NO. MOTOR OF 650 SHAFT HORSEPOWER it has been estimated that the yearly operating expense, including all charges on the investment, is ap- proximately 20 per cent lower than for a steam tug of the same power. It has been estimated that this saving will in 2% to 8 years make up for the, higher initial cost of the oil- electric as compared with the initial cost of the steam tug.”’ New YORK CENTRAL LINES No. 34 was designed by J. W. Millard and Bro., and built and outfitted by the taten Island Shipbuilding Corp. The hull, with a length overall of 108 feet 3% inches, a 20-foot beam, and depth of 13 feet 3 inches and a draft of 9 feet, was launched on Oct. 15, 1926. Miss Jennie M. Hutter of the New York Central lines marine department acted as sponsor. The _ oil-electric power of the boat consists of two Ingersoll-Rand type PR, 6-cylinder 4- cycle, solid injection, 14-inch diameter by 19-inch stroke, oil engines, each direct connected to a 270-kilowatt. General Electric compound wound gen- erator and 30-kilowatt exciter. These oil engine generating sets operate non-reversing at a constant 34—TWO HORSEPOWER EACH DIRECT CONNECTED TO A 270-KILOWATT GENERAL ELECTRIC GENERATOR AND 30-KILOWATT EX- CITER—THE GENERATORS SUPPLY POWER FOR ONE 650 SHAFT HORSEPOWER MOTOR—THE EXCITERS FURNISH POWER FOR ELECTRIC AUXILIARIES AND FOR EXCITATION FOR MAIN MOTOR INGERSOLL-RAND OIL ENGINES OF 400