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Twin Screw Motor Tanker Blue Sunoco Built by Sun Shipbuilding & Dry Dock Co. for the Sun Oil Co. Electrical Control Equipment on Diesel Tanker Blue Sunoco RACTICALLY every recently Prermictea modern vessel is fitted with electrically driven auxilia- ries. Where the diesel engine is used as motive power the auxiliaries are bound to be electrically operated ex- cept in the rare cases where steam is required for some special purpose in the operation of the vessel. In applying electric. motor drive to deck and engine room machinery the de- pendability and satisfactory operation of control equipment is of major im- portance. Such control equipment for the recently completed twin screw The author, Wm. Hetherington Jr., is one of the Jeading marine engineers of Cutler-Ham- mer Inc. and is an expert on electrical control apparatus and its application to shipboard By Wm. Hetherington Jr. diesel tanker BLUE Sunoco will be described later in this article. The twin screw motor tanker BLUE Sunoco was built by the Sun Ship- building & Dry Dock Co., Chester, Pa., for the Sun Oil Co., Philadel- phia. She was launched on April 6 and was completed April 12. She is intended for coastwise ocean service and also for use on the St. Lawrence river and the Welland canal between Montreal and the Great Lakes. Her principal dimensions are: Length over all, 255 feet; length between per- pendiculars, 246 feet 6 inches; depth molded, 18 feet 6 inches; deadweight, 2350 tons; corresponding draft, 15 feet 6 inches; capacity of main cargo CONTROL PANELS FOR WINDLASS AND FOR FORWARD BILGE PUMP CONTROLS 30 MARINE REVIEW—July, 1929 tanks, 20,000 barrels; speed, 9% knots. The BLUE SuNOoCco is of single deck type and her general arrangement on deck is shown in an accompanying illustration. An expansion trunk is fitted over the full length of the cargo tanks. The hull is constructed on the Isherwood longitudinal “bracketless” system and the machin- ery is located aft. The fuel oil tanks and pump rooms are also lo- eated aft while the dry cargo space is forward. The forepeak is arranged to carry fresh water. The main cargo tanks of which there are seven are divided longi- tudinally by an oiltight center line bulkhead making a total of fourteen individual tanks. The midship steel house is arranged for the accommo- dation of captain, officers, hospital and wheelhouse. The engineers, crew, messrooms and cold _ storage rooms are accommodated in the poop *tween deck. All the rooms are large and well ventilated. This tanker was designed as well as built by the shipyard and is en- tirely modern in every respect, hav- ing complete deck equipment, elec- tric light plant, cold storage, hydro- electric steering gear, heating system, electric capstan, electric windlass, ventilating system and a cargo oil system arranged for the rapid load- ing and discharge of liquid cargo. She is built to the highest class of