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54 S. S. THORPE and CLASS—River Towboat—Stern Wheel—Steam Name—S. S. THORPE Owner—Upper Mississippi Barge Line Co. Builder—Dubuque Boat & Boiler Co. Naval Architects—T. R. Tarn; Cox & Stevens Launched—March 24, ’27; completed, Aug. 2, ’27 Home Port—Minneapolis, Minn. Sister Ships—C. C. WEBBER, GENERAL ASHBURN and JOHN W. WEEKS HULL PARTICULARS Length over all, 159 feet 4% inches, length between perpendiculars, 132 feet; breadth mold- ed, 35 feet; depth molded, 5 feet; draft, mean with 30 tons of fuel, 42 inches; displacement loaded, 428 short tons; gross tonnage, 320; net tonnage, 197; bunker fuel oil capacity in tons maximum, 45; towing capacity, 3000 deadweight tons. MACHINERY PARTICULARS Main Engines—Two, twin tandem compound condensing steam engines built by Nordberg Mfg. Co. Diameter high pressure cylinder, 15 inches. Diameter low pressure cylinder, 30 inches; and a common stroke of 6 feet 6 inches. Indicated horsepower, 600 at 50 per cent cut- off taking steam at 250 pounds pressure, 125 degrees Fahr. superheat and a vacuum of 26 inches. Normal revolutions per minute, 18. Each engine is connected to a crank on the stern wheel by cast steel Pitmans 30 feet 6 inches long in two sections joined at the middle. Each DESCRIPTION One of four river tow- boats built for service on the upper Missis- sippi river between St. Louis and Minneapolis. These boats are ex- ceptionally economical due to the advanced design of the twin tandem compound con- densing steam engines which have been fitted. Steam is generated at 250 pounds and is su- perheated to 125 de- grees Fahr. end is equipped with adjustable boxes of pat- ented Nordberg non-pinching type. Boilers—One, marine water tube type built by Foster-Wheeler Corp.; size, 3072 square feet of heating surface. Oil is used as fuel and induced draft is supplied by fans made by the American Blower Co. AUXILIARY EQUIPMENT Manufacturers of: Pumps—Worthington and De Laval Condenser—Worthington Pump & Mach. Corp. Evaporator and Distiller—Davis Eng’r Corp. Capstans—Clinton Iron Works Steering Engine—Marietta Mfg. Co. Refrigeration—Lipman Refrigeration Co. Oil Burning Equipment—Coen Co. Superheaters—Foster, radiant type Electric Generators—Two 25 k.w. Engberg Soot Blowers—Diamond Power Specialty Feed Water Heater—Davis Eng’r Corp. The S. S. THORPE and sister boats during this year will engage in river transportation on the upper Mississippi as a part of the Mis- sissippi-Warrior service operated by the Inland Waterways Corp. The present equipment con- sists of four towboats and sixty cargo barges. The auxiliary equipment is of high grade and quite complete. The accommodations for offi- cers and crew afford every comfort. MARINE REVIEW—April, 1928