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138 of four-cylinder triple-expansion recip- rocating engines operating the wing shafts, and a low-pressure turbine of the. Parsons type driving the center shaft. The steam, after passing through the successive cylinders of the reciprocating engines, flows nor- mally into the turbine; and although the pressure at entrance is only about 10 lb. absolute as compared with about 200 Ib. at the reciprocating engines, the exhaust turbines enables the whole of the energy in the exhaust steam to be utilized before it passes to the con- denser. Thus the turbine, notwith- standing the low initial steam pressure, develops about 18,000 H. P. which is slightly more than the power. devel- oped by each of the two reciprocating engines. The result is very much higher economy than is possible with reciprocating engines only. Messrs. Harland & Wolff, as is well known, have made a specialty of the combina- tion type of machinery; indeed no firm has done more in the adoption of this system than the Belfast builders, who have completed, or have now in hand, combination machinery of a total horsepower of 450,000. The Britannic's machinery is expected to give a total horsepower of 50,000, the largest power so far developed by a combination set. The turbine, which has been made en- tirely at the Belfast works, is the largest marine exhaust turbine yet made, the weight complete being close upon 500 tons, Turbine Exhaust The turbine exhausts its steam into two condensers, but provision is made by means of a special valve so that the exhaust steam from the reciprocat- ing engines may pass direct to the condenser instead of through the tur- bine to the condenser. This confers the advantage that no reversing or astern turbine is necessary on the cen- ter shaft. The astern driving of the ship, and therefore all maneuvering in port, is done by the reciprocating engines on the wing shafts. The "change over" from driving ahead with all three propellers to operating the wing shafts astern, as in the ordinary twin-screw ship with reciprocating en- gines, is effected almost instantaneous- ly. In maneuvering, the ship corres- ponds exactly, so far as the manipula- tion of the machinery is concerned, to a twin-screw vessel. The steam-generating equipment consists of 24 double-end and five sin- gle-ended boilers of the ordinary ma- rine type and fitted with 159 furnaces. The boilers are distributed in six boiler rooms, separated by watertight bulkheads and by coal bunkers athwart the ship between the two inner skins and -tervening enclosed space. THE MARINE REVIEW carried up to a level far above the load water line. Thus there are practically three division walls between each boil- er room, with a very considerable in- The waste gases, etc., from the furnaces are con- -yeyed to four funnels, which rise to a height of about 180 ft. above- the keel of the ship. Needless to add, the system of aux- iliary machinery throughout the ship is very complete, and elaborate ar- rangements have been made in connec- tion with the pumping of the various compartments. It is possible inde- pendently to pump any compartment, and the valves in connection with the pumping can all be operated from one of the decks far above the water line. Battleship Oklahoma Launched : The . battleship Oklahoma was launched from the yard of the New York Ship Butlding Co.; Camden, N. Jon Match. 23; The Oklahoma and her type sh:p are distinguished by several unusual. striking is the The forward features: The ; most CUrret ~atraneement, and alter turrets are' of the = triple mount design, each.- carrying. three 14-inch rifles. Each of the other two turrets carry two 14-in, rifles. Anoth- er distinguishing feature is the single funnel. This design was adopted by April, 1914 reason of the fact that the vessel is to burn oil exclusively. The propelling machinery consists of two sets of triple-expansion engines and 12 Babcock & Wilcox water tube boilers, working at a pressure of 265 lbs. per sq.-in. The engines at full speed will make about 125. revolutions per minute, and the indicated horse- power will be about 25,000 on trial. Dimensions and Batteries The vessel is of the following di- rhensions: ft. in. Length on load water line. .575 0 Lenoth < Over: alle coco 583.5426 Beam, extremece oe wicic., 95 2y% etal "draughtecr kc 28:6 Trial displacement. ..222..4 27,500 tons Rei PROBES cious Geen 20% knots The secondary battery consists of 21 5-in. rapid fire guns, for 'defense against torpedo attack. There are also fitted four submerged 21-in. torpedo tubes and 10 small guns for saluting and landing purposes. The vitals of the vessel are pro- tected by a deep belt of armor on the sides and by armored decks and bulk- heads. Protection against submarine mines and torpedoes is afforded by means of close sub-division in the low- er part of the vessel. The vessel will be lighted by elec- tricity -and = Nave .several:-large and LAUNCHING THE BATTLESHIP OKLAHOMA OVE . é -lie Al. THE. NEW YORK SHIP ¢ BUILDING CO.'S YARD "