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Dy eeonin 1: ghthouse Tender—Stern Wheel—S team Name—WAKEROBIN Owner—U. S. Government—Bureau of Light- houses. Builder—The Dravo Contracting Co. Naval Architect—The Dravo Contracting Co. Launched—Oct. 2, ’26; completed April 21, ’27. Classification—Western Rivers HULL PARTICULARS Length over all, 182 feet; length between per- pendiculars, 153 feet 6 inches; breadth molded, 43 feet; depth molded, 5 feet 6 inches; draft, 3 feet 6 inches; displacement loaded, 520 short tons in fresh water; gross tonnage, 900; bunker coal capacity in tons, 50; speed, 12 statute miles per hour. MACHINERY PARTICULARS Main Engines—Two high pressure, single cylinder horizontal, non-condensing steam en- gines built by Frisbie Engine and Machine Works. Size, 18 inches in diameter and 9) inches stroke, each connected to the stern wheel cranks on each side through pitmans. Boilers—Three horizontal underfired flue boil- ers of the Mississippi river type operating with a working pressure of 210 pounds per square inch. Size, 42 inches in diameter and 26 feet long; fuel, coal. AUXILIARY EQUIPMENT Pumps—Worthington Pump & Mach. Corp. Capstan—Laclede and Hyde Windlass Co. Steering Engine—The Dravo Contracting Co. Sternwheel—The Dravo Contracting Co. DESCRIPTION A steel vessel of West- ern river stern wheel type driven by two high pressure noncon- densing steam engines, one on each side con- nected to the crank of the stern wheel. The total horsepower de- veloped by the two en- gines is 620. This ves- sel operates on the Mississippi river be- tween Minneapolis and the Missouri river mouth and serves as a tender to lighthouses. Electric Generators—Terry & General Electric Distiller—Davis Engineering Corp. The hull, deck and pilot houses are constructed of steel. The main deck is also of steel and the boiler deck is of wood, canvas covered on the outside. Two masts are fitted forward, one on each side, with two spars and necessary tackle. A combined steam and hand capstan is located on the main deck forward for han- dling the tackles, lines and landing stage. The hull is strengthened with longitudinal and transverse structural bulkheads and members eliminating the need for hog bracing. The sternwheel is of wood with staggered buckets, half on each side of the center. All necessary auxiliaries are provided, in- cluding a _ two-unit electric plant, distilling system, steam-ram steering engine, oil and water tanks, and feed water heater. There is also a small donkey boiler. Comfortable quarters for officers and crew are located in the boiler-deck house. Heat is supplied through steam radiators. The main deck house between boilers and engine room is used for cargo and supplies. This tender was built under contract of Oct. 9, 1925, with the Dravo Contracting Co., Pittsburgh at a cost of $187,500. Besides operating on the Missssippi_ the WAKEROBIN occasionally goes into St. Croix river and lake and the Illinois river. She supplies lamplighters and places buoys. v7] see ate q MARINE REVIEW—April, 1928