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32 Name—OHIOoO Owner—Mississippi Valley Barge Line Builder—The Dravo Contracting Co. Naval Architect—Cox & Stevens Engineers—Standard Unit Navigation Co. Launched—June 17, 30; completed, Sept. 19, Sister Boats—TENNESSEE; INDIANA and LouT- SIANA respectively launched; July 14, ’30; June 16, 730; Oet. 9, ’30; and completed, NOV. 35. 302 OCH 21h, 330" Deen 49. 30: The InpIANA and LoUISIANA were built by the Charles Ward Engineering Works. Classification—American Bureau of Shipping HULL PARTICULARS Length over all, 200 feet 1034 inches; length between perpendiculars, 200 feet; breadth molded, 40 feet; depth molded, 10 feet 6 inches; draft, 6 feet 6 inches; gross tonnage, 1323; net tonnage, 416; bunker fuel oil capacity in short tons, 235; speed, 12 miles per hour without tow. MACHINERY PARTICULARS i Main Engines—Two, 3-cylinder uniflow built by Skinner Engine Co.; size, 19 inches diameter x 20 inches stroke; horsepower, 2000 for the two engines at 185 revolutions per minute. In the InpraAna and Lourstana the propulsive power consists of one Westinghouse geared turbine generator set of 2500 horsepower at 3600/900 revolutions per minute. This gener- ator supplies current to two Westinghouse mo- tors of 1000 horsepower each direct connected. Auxiliary Generators—For the Onto and Tren- NESSEE, three of 65, 50 and 15 k.w. capacity, Westinghouse. For the Inprana and LOUISIANA, two Westinghouse of 50 k.w. and 15 k.w. OHIO AND CLASS—River Towboat—Twin Screw—Steam—Electric DESCRIPTION Four vessels of this type were built for Mississippi river sgery- ice. All four are tun- nel stern twin screw propelled and each has a total of about 2000 horsepower. The Onto and TENNESSEE are fitted with steam re- ciprocating engines and the InpIANA and LOUISIANA are fitted with turbine electric drive, the first time this type of machin- ery has been installed in a river craft. Boilers—Two, Babcock & Wilcox watertube marine boilers; total heating surface, 4536 square feet; total superheating surface, 454 square feet; working pressure, 260 pounds; superheat, 200 degrees Fahr; fuel, oil. Super- heaters, oil burners and other boiler accessories furnished by Babcock & Wilcox Co. AUXILIARY EQUIPMENT Pumps—wWorthington Pump & Mach. Corp. Capstans—American Engineering Co. Steering Engine—Marietta Mfg. Co. Propellers—Erie Forge Co. Refrigeration—yYork Ice Machinery Co. Marine Hardware—The Dayton Mfg. Co. Feed Water Heater—Davis Engineering Corp. Evaporator—Distiller—Davis Engineering Condenser—Foster Wheeler Corp. Soot Blowers—Diamond Power Specialty Valves and Fittings—Wm. Powell Co. Radio Equipment—Radiomarine Corp. Oil Purifier—The Sharples Specialty Co. The Onto and her sister boats are unique. It is the first time, it is safe to say, that so much study has been put into the plans for craft of this kind by a private operator. The vessels are twin screw, tunnel stern of substan- tial construction and high power and are now in use for long distance towing on the lower Mississippi. A special type of barge was also developed. These barges have V shaped ends so that they can stow compactly in a large tow. Ten of these barges are handled by each towboat where express service is required and as many as 20 barges may be towed. MARINE REview—April, 1931