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64 Name—MaAry ALICE Owner—Keystone Sand & Supply Co. Builder—The Dravo Contracting Co. Naval Architect—The Dravo Contracting Co. Launched—Oct. 4, ’29; completed, Oct. 24, ’29 Classification—Owner’s Requirements HULL PARTICULARS Length over all, 158 feet 7%. inches; length between perpendiculars, 134 feet 10 inches; breadth molded, 26 feet 6 inches; depth molded, 5 feet 6 inches; draft, 4 feet 2 inches; dis- placement loaded, 365 tons of 2000 pounds each; gross tonnage, 214; net tonnage, 203; bunker fuel cavacity in tons of oil. 34. MACHINERY PARTICULARS Main Engines—Two, 6-cylinder 4-stroke cycle diesel engines built by the New London Ship & Engine works of the Electric Boat Co.; size, brake horsepower, 300 at 250 revolutions. Boiler—One, small boiler for heating; coal fired of 20-horsepower rating. Auxiliary Generator—One, 40 kilowatts diesel engine driven, built: by Fairbanks, Morse & Co. This unit is used for supplying power to the capstan motors, for lighting and for charg- ing the two banks of Exide storage batteries. MARY ALICE—River Towboat—-Stern Wheel—Diesel DESCRIPTION This vessel has an all steel hull, deck house and pilot house. The hull is built with straight sides, flat bottom and scow bow on. the _ transverse system of framing. Propelling power is supplied by two 300- horsepower diesel en- gines, each connected through shafting and gear to a half section of the split wheel. AUXILIARY EQUIPMENT Pumps—American Steam Pump Co. Steering Engine—The Dravo Contracting Co. Refrigeration—Kelvinator and G.E. Electric Motors—Two forward capstans are driven by 25-horsepower electric motors; one capstan on each side amidships driven by 15-horsepower motors Air Compressors—Two, Ingersoll-Rand Batteries—Electric Storage Battery Co. The split stern wheel design with separate engine for each half makes for unusual flexi- bility in maneuvering the boat. The stern wheel is made up of fourteen 34-inch buckets and has a diameter of 17 feet 8 inches. The drive of the Mary ALIcE is similar to that of her two sister ships, the BENWwoop and Betty. The line shafting connected with De Laval flexible couplings runs the length of the boat from the engines to the Dravo pat- ented double geared drive, adjacent to the split stern wheel. There is a_ hand-operated jaw clutch developed by the Dravo company which makes it possible to disconnect the en- gine from the line shafting for warming up the engine, testing, or other reasons. MARINE REVIEW—April, 1930