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February, 1927 MARINE REVIEW ESTINGHOUSE ELECTRIC eAn Electrical Marine “Shifter” for moving barges speedily Tue new double-ended Diesel-electric drill tugs, placed in service by the Pennsylvania Railroad Gompany, move barges from one berth to another or from one dock to the next in a fraction of the time required by other means. Turn around is unnecessary because both ends of this towboat are exactly alike. Each end has a rudder that can be manip- ulated independently, or simultaneously with, the rudder at the other end. This gives enormous flanking power and ability to move a loaded barge directly out from the dock with minimum maneuvering. The control of the propelling motor which actuates the propellers, one at each end, is designed to permit 30 speeds in either direction, can be reversed almost instant- ly. Complete control of propelling and steering is centered in the pilot house. The Diesel engines which operate at con- stant speed, and in one direction at all times, require no maneuvering. Applica- tion and control. of power through West- ° inghouse generators, motors and control apparatus assure high efficiency, flexibility and reliability. Westinghouse Electric & Manufacturing Company East Pittsburgh Pennsylvania Sales Offices in Principal American Cities Service Stations in Principal American Ports Westinghouse X91044 Please mention MARINE REVIEW when writing to Advertisers 39