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Soe In the afterbody, it intersects G strake, which is an inside strake, being only 0.035 feet greater than the molded width. The result of this calculation increases the displacement by 17.53 tons. Launch Navy’s Biggest The battleship ArtzoNA was launched at the Brooklyn navy yard at high tide on June 19, Her sponsor was THE MARINE REVIEW Aguapon is fitted with four water- tight bulkheads, which divide the vessel into five compartments. The first of these compartmens is used as a chain locker, the second and third are util- ized as tanks for the fresh water cargo, the fourth is the engine room, and the fifth is the fuel oil storage tank. From this tank a clock pump fills ‘a fuel ser- vice tank in the engine room, which feeds the fuel injection pumps on the FIG. 1—BOLINDERS EQUIPPED WATER BOAT AQUADON ON HER TRIAL TRIP IN NEW YORK HARBOR Miss Esther Ross, of Prescott, Ariz. As the Arizona stands she _ weighs 13,000 tons and is about 6534 per cent completed. She represents a cost of $7,425,000, and when fitted with guns, armor and other equipment will have cost the government $16,000,000 or more. The vessel’s dimensions are: Length, 608 feet; beam, 97% feet; draught, 28 feet 6 inches. Her arma- ment will consist of twelve 14-inch rifles, twenty-two 5-inch rapid fire guns, four 6-pounders for saluting, three 3-inch field pieces and four aeroplane guns. Arizona will be fitted with turbine engines. Fuel Oil Replaces Steam HE recent successful trials of F Aguapon, a New York harbor water boat which has been fitted with fuel oil engines, have aroused con- siderable interest in the vessel. Agua- pon is 105 feet long, with a beam of 22 feet, a draft of 9 feet 3 inches, and a load displacement of 270 tons. Her new engine is a four cylinder, 100-horsepow- er, direct reversible Bolinders, a Swed- ish engine of the so-called semi-diesel type, which burns fuel oil. It is said that on her trial trip the vessel attained a speed of eight knots per hour with- out load, and of seven knots per hour with load, at a fuel consumption of 63 pounds of oil per hour. A feature claimed for the Bolinders engine is the ability to start on low air pressure, it being stated that the pressure in the starting air tanks during Aguapon’s trial trip did not exceed 120 pounds. engine. A water tank to supply the water injection pumps on the engine, the starting air tank, and a whistle air tank are also installed. A pump to facili- tate handling the water cargo, situated in the engine room, is driven by the main engine, the exhaust gases of which are carried up through mufflers into a funnel 12 feet in height. In installing the new engine, the foundation was stiffened by additional plates. Bushings were fitted in either end of the stern tube, reducing its prac- September, 1915 tical inside diameter from nine to five inches to fit the new shaft installation. AQUADON is owned and operated by the Boston Provision & Ship Supply Co. I chant ships lost since the war be- gan, it is at first glance rather sur- prising to learn that the gross tonnage and number of commerce carriers now under construction in ship yards of the United Kingdom is materially less than a year ago. Much of the usual mer- chant vessel building facilities are now occupied with naval construction, and a large percentage of skilled workmen are either at the front or in government service, so that the loss of about 215,000 gross tons is comparatively small. Re- turns compiled by Lloyds register of shipping, which only takes into account vessels of 100 tons or more, construction on which has actually begun, show that, excluding warships, 442 vessels, of 1,506,925 gross tons were under construc- tion in the British isles on June 30. This is about 215,000 tons less than the corresponding tonnage for June 30, 1914. Detailed figures are as follows: June 30,1915. June 30, 1914. Fewer Vessels Built N VIEW of the many British mer- Description. Gross Gross Steam. No. tonnage. No. tonnage. Steele esse ec: 434 1,505,025 463 “1,717,747 Minor sere cans Seb ieue Due GE Sharess abate selene Wood and composite Lotalevercees 434 1,505,025 463 1,717,747 Sail. Steel evs. 6 1,450 13 4,277 IB fopatgs CRUMAN Aiea a ee . Sekine Pie pS Wood and composite.... 2 450 1 100 Motalen sc. 8 1,900 14 4,377 Total stm. & sail 442 1,506,925 477 1,722,124 FIG. 2—AQUADON’S FOUR-CYLINDER, 100-HORSEPOWER BOLINDERS ENGINE