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VUTNUTUEUIADUUUUOLIETNN UAT ENERAL arrangement of the Mississippi River towboat Herbert Hoover. In recent years the de- meg velopment in design of river craft has’ received great impetus through the courageous initia- tive of the Inland Wa- terways Corp. under the direction of Major General T. Q. Ashburn. New types and application of power are being tried out under practical conditions of op- eration. UOUUUTAUEENOUIAUTGUILITHHELIHE ting air for the reversing operation. The fuel control lever and revers- ing lever are so interlocked that re- versing cannot be done while the en- gine is in operation, nor can the start- ing air be turned on while the engine is in the act of reversing. Thrust bearings mounted separately from the engine base are of the Kingsbury oil lubricated disk type. The hull is of substantial steel con- struction throughout with a center-line bulkhead except in the way of the en- gine room where it is of truss con- struction, forming the main strength girder. Transverse, closely spaced, framing is used and there are six transverse watertight steel bulkheads. In the way of the engine room on each side oiltight longitudinal bulkheads form wing fuel an water tanks. Fore and aft intercostals are run below the main deck at either end of the vessel. The superstructure is designed to give added strength to the machinery deck amidships. This deck carries a weight in machinery, equipment and fuel of about 500 tons. Engine Room Auxiliaries Among the auxiliaries in the engine room are two Atlas-Imperial diesel en- gine generating sets each connected to a 75-kilowatt 125-volt direct current Westinghouse generator. There is also an additional Atlas-Imperial diesel en- gine generating set direct connected to a 15-kilowatt Westinghouse genera- tor. The 75-kilowatt generators are each of sufficient capacity for all of the auxiliary load, including steering gear, pumps, lighting, refrigeration, capstans and radio, while the small generator is used only in port. There is a two-stage motor driven Worthing- ton air compressor. There is also a small 11 cubic feet per minute steam driven emergency air compressor. Pumping equipment is complete and was supplied throughout by the Worth- ington Pump & Machinery Corp. There are four centrifugal pumps, two for water service and two for jacket cooling, each driven by a 15-horse- power motor. For oil circulation there are two rotary pumps each driven by a 30-horsepower motor. In addition there is a centrifugal fire pump driven by a 20-horsepower motor and a recip- =~ o8 5 ——, fSKWER] _— feteitatas eet ii SS fisewten one NOOKPMEINTODK « 12, © : 7 “0 a yy “os -— a See = eee iF eae Sciatan VHOUR DIESEL ENG, LJ rai SE . “PT SSeS FIR FE -e OOOOCOO0O0E = = s ‘ tape ed rocating circulating bilge pump driven by a 5-horsepower motor. For both culinary and engine use the river water is filtered by being passed through a Roberts water filter of 3000 gallons capacity in 24 hours. For drinking purposes the water is passed through a small still. Deck machinery on this powerful modern river towboat was supplied by the American Engineering Co. and consists of four capstans, two electric motor driven with 25-horsepower mo- tors and two driven by 15-horsepower steam engines. There is also a deck winch driven by a 5-horsepower motor serving a boom for general service. The four. rudders in pairs athwart- ships are controlled by the two steer- ing gear units, each pair separately from the wheelhouse. One pair of rudders are located forward and one pair aft of the propellers, giving the vessel a maximum maneuverability. There are two American Engineering. Co. hydraulic electric steering gear units in the engine room direct con- nected to the rudder quadrants with steel cables. One of these units is driven by 25-horsepower motor and the other, for the forward rudders, is driven by a 15-horsepower motor. Con- trols to the steering engines from the pilot house consist of shafting and sears operated by two levers. An Original Design Adopted Credit for the innovations worked out in the towboat Hrersert Hoover is due Major General T. Q. Ashburn and his staff. The detailed design and original plans and specifications were worked up by The Dravo Contracting Co., Pittsburgh. The boat is classed in the American bureau of shipping and was constructed under its special sur- vey. I. N. Davenport, secretary and general manager of the Dubuque Boat & Boiler Co., was in active charge of construction throughout. The next international navigation congress will be held at the Doges’ Pal- ace, Venice, in September. Delegates from the principal maritime nations and from.private organizations are ex- pected to attend. Among the subjects to be discussed are inland navigation, harbors, docks, lighthouses and ship- building and construction of ports. 1100 B. H. P. McIntosh & Seymour Diesel Engines, Installed in the Twin eo Screw River T'owboat Herbert Hoover MARINE REVIEwW—September, 1931 31