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40 WILLIAM DICKINSON—River Towboat—Twin Screw—Diesel Name—WILLIAM DICKINSON Owner—Marquette Cement Co. Builder—Marietta Mfg. Co. Naval Architect—T. R. Tarn Completed—October, 1930 Classification—American Bureau of Shipping HULL PARTICULARS Length overall, 125 feet; length between per- pendiculars, 124 feet; breadth molded, 26 feet; depth molded, 7 feet; draft, 5 feet 6 inches; dis- placement loaded, 384 tons; gross tonnage, 390; bunker fuel capacity in tons, 40; speed, 12 statute miles per hour. MACHINERY PARTICULARS Main Engines—Two, 6-cylinder, 4 cycle, solid injection, direct reversible diesel engines built by the Atlas-Imperial Diesel Engine Co. Size, 14 inches in diameter by 18 inches stroke, each engine develops 350 horsepower at 225 revolu- tions per minute and have reserve power should it be required. Auxiliary Generators—Two, three-cylinder, 4% x 6 inches, direct driven 121%4-kilowatt gen- erator compressor sets, self contained on a com- mon bedplate; Cummins engines. The air com- pressors are Ingersoll-Rand, 5 x 24% x 4 inches in size driven through friction clutches from the engine generator shafts. DESCRIPTION \ This vessel was de-: signed for towing bulk cement barges on the Mississippi and is now in operation from the Cape Girardeau, Mo., plant of the owner to St. Louis and Memphis. The steel hull is of open tunnel type with modified scow bow, square transom stern, round bilges and is framed transversally. Two diesel engines. AUXILIARY EQUIPMENT Manufacturers of: Pumps—Gould; Viking Capstans— Marietta Mfg. Co. Steering Engine—Marietta Mfg. Co. Propellers—F. Ferguson & Son Refrigeration—Frigidaire Marine Hardware—The Dayton Mfg. Co. Oil Purifiers—De Laval Separator Co. Thrust Bearings——Kingsbury Mach. Works Searchlights—Carlisle & Finch Co. Telephone System—S. H. Couch Tel. Co. Telegraphs—Chas. Cory Corp. Valves & Fittings—cCrane Co. Fire Prevention—Lux System The propellers are four-bladed solid wheels, of semi-steel, 6 feet in diameter with a pitch of 63 inches and turn inboard. The tunnels, or more correctly half tunnels, in section are semi- hexagonal in shape which seems to be something new in tunnel design, the principal being that a semi-circular section would offer less resistance to rotary motion of the water. By disturbing this rotary action it is believed that an increase in thrust is obtained. Reports of actual Operation of this vessel dur- ing several months indicates satisfactory per- formance in all respects. MARINE REvieEw—April, 1931 oS 6 ae a Ey SPR ey SY eek es ee ee