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Ship Building Co. The launching took place on April 30, the sponsor being Mrs. Kenneth A. Scott. Completed early in September the COoULBY sailed on her maiden voyage on Sept. 10, from Lorain, O., with a cargo of 14,650 tons of coal. This vessel was built to the highest class in Lloyd’s and the American Bureau of Shipping for lake service. General particulars and dimensions are separately grouped in Table I for convenient reference. Some displace- ment aft was sacrificed when the lines cf the hull were laid down in order to give the vessel an unusually clean and easy run to the propeller. In construction the vessel is a com- bination of the transverse and longi- tudinal systems. The bottom frames, tank top stiffeners, and spar deck beams run _ longitudinally and_ the side frames and hopper stiffeners run transversely. Straight arches are used. This construction is used to give a tank top of much _ greater strength than is possible with the usual transverse method, and also to give better support to the spar deck stringers. In building the propelling machinery for this ship two points were kept especially in mind. One was to build it heavier than customary so_ that it could easily stand the heaviest service without danger of developing TABLE II Principal Auxiliaries on S. S. Harry Coulby 1—Main feed pump, Warren, horizontal simplex 1—Auxiliary feed pump, Warren, horizontal duplex 5 2—Ballast pumps, Morris, 15-inch centrifugal with engines 2—Ballast pumps, Warren, vertical duplex 1—Mates pump, Warren, horizontal duplex 1—Sanitary pump, Warren, vertical duplex 1—Lift pump, Warren, horizontal duplex 1—Condensate pump, Union, horizontal dup'ex 1—Ice water pump, Warren, horizontal duplex 1—Cooler pump, Warren, horizontal duplex 1—Circulating pump, Morris, 12-inch centrifugal with 9 x 9 engine 2—Oil pumps, Warren, horizontal duplex 2—Generators, Engberg, 25-kilowatt with engine 1—Generator, Engberg, 10-kilowatt with engine 1—Two-ton, Frick ice machine, electric _— Q Ww POYNHUUPRAE = S Ao, woe i) Ack MNAKOOHROND —— et et et KX ts et lo a a Ng 1—Two-inch centrifugal pump, Dravo-Doyle, driven by two horsepower motor 1—Thermo-fan, motor driven 6—Deck engines, size 2— Hatch engines, size, 1— Windlass, spur gear, size, 1—Direct acting steering engine, size, Note—All of the Deck Machinery was built by the American Ship Building Co. any weakness. The other was to give it unusual finish so that its fine ap- pearance would be an additional in-~ centive to the officers responsible for its operation to keep it in good condi- tion. A single propeller:is driven by one triple expansion steam engine with high, intermediate and low pressure cylinders of 25%, 41, and 67 inches diameter, respectively. The common stroke is 42 inches, the engine de- veloping 38000 indicated horsepower at 95 revolutions per minute. The cylinders are arranged with the low pressure forward, the intermediate aft and the high pressure in the cen- ter. The intermediate and low pres- sure cylinders have steam admitted through double ported slide valves, while the high pressure cylinder takes steam in the center through a piston valve. All the valves are actuated by a Stephenson link valve gear of the cverhung type. Both intermediate and low pressure slide valves are fitted with Lovekin assistant cylinders to overcome the weight of the valves and their inertia. All the main engine cylinders are steam jacketed both at the bottom and top heads, and the high pressure GENERAL ARRANGEMENT OF THE MAIN ENGINE OF THE S. S. HARRY COULBY TRIPLE EXPANSION STEAM ENGINE OF 3000 I. H. P. 15 MARINE REVIEW—Cctober, 1927