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24 MARK TWAIN—River Towboat—Stern Wheel—Steam Name—Mark TWAIN Owner—Inland Waterways Corp. Builder—Howard Ship Yards & Dock Co. Naval Architect—Inland Waterways Corp. Launched—Aug. 29, ’31; comp., Feb. 8, ’32 Classification—Owner’s requirements HULL PARTICULARS Length over all, 196 feet; length between per- pendiculars, 160 feet; breadth molded, 42 feet; depth molded, 6 feet; draft, 4 feet; gross ton- nage, 513; net tonnage, 476; bunker fuel ca- pacity in tons, 110; speed, about 10 miles. MACHINERY PARTICULARS Main Engines—Two, tandem compound con- densing, built by Marietta Mfg. Co. Size, 17 x 34 inches and 9 feet; horsepower 500 each at from 20 to 25 revolutions per minute. Boilers—-Two, Babcock & Wilcox watertube marine boilers with a total heating surface of 4132 square feet and 272 square feet of super- heating surface. Working pressure, 300 pounds per square inch; 150 degrees Fahr. superheat; fuel, oil. Superheaters, oil burning equipment and furnace brick supplied by Babcock & Wilcox Co. Soot blowers, Diamond Power Specialty Auxiliary Generators, Exciters—(turbine) Westinghouse AUXILIARY EQUIPMENT Pumps—Worthington Pump & Mach. Corp. Capstans—Three, One by American Machine & Eng. Corp.; two, Iowa Machine Works Steering Engine—American Engineering Co. Refrigeration—Lipman Mfg. Co. Main Condenser—wWorthington Pump & Mach. A -tti or DESCRIPTION The Inland Water- ways Corp. is doing a valuable work in devel- oping the most prac- tical and efficient mod- ern river craft. In the Mark TwaAIN full rein has been given in the improvement of steam conditions for a tandem compound condensing type of steam engine with high _ pressure steam and _ superheat. The vessel is of steel construction throughout Anchors—Baldt Anchor Chain & F. Corp. Marine Hardware—The Dayton Mfg. Co. In the design of this vessel, while holding to the general features which have proved satis- factory in years of practical experience with river navigation, many hitherto unheard of in- novations have been applied. It is not custom- ary for instance on river craft to use the water- tube marine type of boiler nor is it customary to use oil as fuel. It is still less customary to go to such high pressures as 300 pounds per square inch and 150 degrees superheat. This vessel represents therefore the results of a deliberate engineering study with the view of making use of modern developments in every possible practical way in this powerful river craft. Among other things for instance is the turbine driven hydraulic steering gear for han- dling the three main rudders and two monkey rudders. The pumping equipment on this vessel would do credit to a large cargo vessel and consists of main condenser circulating; main steam air ejec- tor; backwash filter; fresh water; fire; portable oil; filter supply; fuel transfer; and boiler feed, all supplied by Worthington Pump & Machinery Corp. There is a separate condensing plant, wa- ter still, water filter and softening plant, and re- frigerating equipment. The cabin and pilot house is of wood construc- tion and has accommodations for a crew of 26. Each of the two tandem compound condensing steam engines are connected to cranks of the sternwheel by pitmans. The sternwheel is 24 feet in diameter, 25 feet wide; 16 paddles. ci | ay re eS aN Wis ILS ee LAY Az MARINE REviEw—April, 1932