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September, 1920 5200 tons will be carried in the fore and aft side bunkers, 1900 tons in the athwartship bunkers, and 700 tons in the double-bottom tanks. All the age tanks, including the six double- bottom tanks, used for oil, no water ballast connections being pro- vided. These are usual where doub!e-bottom are used for oil, involve complica- tions. To make the coal bunkers suitable for carrying oil, a large amount of struc- stor- aie solely connections tanks and many DOUBLE BOILER ROOM OF AQUITANIA SHOWING tural steel work was necessary. For Instance, all the bunker bulkheads have heen specially stiffened, so that defor- mation will not occur with the weight of oil pressing against them. All the Plate joints have been specially treated, the general practice adopted being to fit stout, double riveted, joggled plate straps over each plate landing, making a thoroughly oiltight joint. Special at- on has been given to plating and Mveting of all steam pipe trunks and Passages where these penetrate the toss bunkers, Transverse wash bulkheads have Peen fitted in all the side bunkers, and Stitable wash bulkheads have also been THE MARINE. REVIEW the cross oil constructed in bunker tanks to that not iM. any way affected by the movement of the ship. For the full length of the side bunk- ers, and also around the cross bunkers, gutterways have been constructed to catch any oil which may find its way outside the tanks through leaky joints. insure rs In communication with these gutter- ways are bilge wells in each boiler room from which the oil bilge well pumps draw. In the cross bunker storage tanks GENERAL ARRANGEMENT OF FURNACE FRONTS AS forward of boiler rooms Nos. 1, 2 and 3, four settling tanks have been con- structed, each tank being of. 60-ton capacity. In No. 4, boiler room, two settling tanks of similar capacity each have been incorporated in the side bunkers, one port and one starboard. In the AguiraniA, there are four boiler rooms, the three forward ones each containing six double-ended _ boil- ers, and the after one three double- ended boilers. Two settling tanks are provided for each group of three boil- ers. In certain parts of the boiler room, the side bunkers overhang the wing boilers, and to insure that there will be no chance of oil dripping on 491 the hot boiler tops, special screen plates have been fitted in way of these overhanging parts, so that any oil which may leak through will be directed to the oil gutter below. In addition which has tight joints welding has to the special riveting adopted to insure oil- all the tanks, electric also. been. largely em- ployed, in an effort to secure a thor- oughly sound and substantial tank con- struction. The oil fuel will be burned under the White low pressure mechan- been on WELL AS STEAM COIL DRAIN OBSERVATION TANKS ical system installed by its inventor. The pumping, and heating plant has been supplied by Messrs. Brigham & Cowan, South Shields, England, and a complete installation in duplicate has been provided for each group of. three boilers, that is, in the large boiler rooms each containing six boilers, there are four sets of pumping and heating plants, while in the small boiler rooms there are two sets. This insures that only under very exceptional circum- stances will the supply of fuel to the burners be interfered with through any fault of the pumping plant. The pump- ing and filling arrangement throughout the ship has been prepared on a sub-