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A-E-CO Electro-Hydraulic Steerer (Parallel Ram Type) On the New Panama Tugs Two of the electro-hydraulic steerers shown above will be installed on the two 125-foot Diesel-electric tugs that are being built by the Panama Canal Commission. In this steerer the Hele-Shaw High-pressure pump with reversible discharge is used, making it possible to install a follow-up mechanism of extreme simplicity. The pump itself is direct-connected to a constant speed electric ‘motor and always rotates in the same direction at the same speed, regard- less of the amount and direction of the discharge. Write for information. American Engineering Company Kensington Station Philadelphia, Pa. Hele-Shaw Hydraulic Pump MARINE REVIEW—July, 1927 63