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December, 1926 MARINE REVIEW M. S. Steel Electrician Silent Queen of the Lakes ROM a crawl to full speed ahead, and fifty steps between, a 1700-ton ship silently responds to every touch of the control pedestal. No bells clang in the engine room; from the pilot house the Captain guides every movement, as easily and surely as you drive your automobile. M. S. Steel Electrician is the first lake vessel to use pure voltage speed control of Diesel-Electric drive. Voltage control accentuates the inherent advantages of Diesel-Electric drive. Between slow speed and full speed are fifty safe, sure steps of about 3 propeller rpm. variation. Propeller speed is independent of the load or current. Control is positive and instant, though the simplest arrange- ment of apparatus and circuits. No circuits are closed or opened. The Steel Electrician, owned by the United States Steel Products Company, is equipped with Westinghouse apparatus. The propelling machinery consists of a 750 s-hp. d-c. propulsion motor supplied with power from three 205 kw. Diesel engine-driven generators. The motor is excited at constant value, in one direction, speed variation being attained by variation of the generator field excitation. Westinghouse Electric & Manufacturing Company East Pittsburgh Pennsylvania Sales Offices in All Principal Cities of the United States and Foreign Countries X88814 Please mention MARINE REVIEW when writing to Advertisers 49