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252 square feet, through which the enor- mous quantity of 12,500 tons of sea water pass per hour, this being neces- sary for the condensation of the steam, and the efficient working of the turbines. It may be interesting to note in passing that if the condenser tubes were placed end to end they would reach a distance of nearly 50 miles. In addition to the condensing plant already described, the machinery spaces contain a tremendous amount of additional apparatus required to act in an auxiliary capacity for the main propelling machinery due to working conditions in port; for all purposes in connection with the safety of the ship as regards rapidity and efficiency, dealing with collision, dam- age or fire outbreak, and also - for maintaining the various services for the comfort and convenience of the passengers. The steam pipe arrangement is such that in the event of any one turbine being disabled, the other three shafts can be worked, and since the turbine, as a machine, is eminently suitable for taking an overload, the fact of any single shaft being out of action would not appreciably reduce the speed of the ship. Astern Turbines A special feature is the large power which is provided for going astern, there being a separate turbine on each of the four shafts for this pur- pose. Here again economical use of steam has been insured by compound working. Thus the separate high pressure astern turbines, situated one in each wing engine room, exhaust into their respective low pressure tur- bines, these latter being incorporated in the same casing as the low pres- sure ahead turbines in the center engine room, one on each of the inner shafts. The total length of the en- gine space is 84 feet. A further idea of the engine dimen- sions may be had by consideration of the weights. The high pressure ahead turbine is approximately 140 tons weight, the intermediate pres- sure turbine 150 tons weight, while each of the low pressure and astern turbines complete weighs 450 tons. The high pressure astern turbine weighs 120 tons. All the main turbines are of the Parsons reaction type, the steam pass- ing alternately through wings of fixed and moving vanes. The moving blades are attached to the exterior of a drum and are interspaced be- tween the rings of fixed blades, which are attached to the inside of a cas- ing enclosing the drum. To this drum or rotor is coupled a line of THE MARINE REVIEW shafting and propeller, which trans- mit the power for: driving the vessel. The total blades or vanes in the turbines amount to over 1,000,000 in number and range in height from 1% in. to 20 in. The problems in design to which the blading gave rise have been care- fully considered, and the system and method of securing the blades, finally evolved after many costly experi- July, 1914 fans have been installed, the whole being capable of handling the enor- mous volume of 20,000,000 cu. ft. per hour. The huge maneuvering and other steam valves are each operated by a combined steam and hydraulic revers- ing gear, which enables the engineer officer in charge to have full con- trol of all engine rooms from the starting platform, by simply throw- BOW OF AQUITANIA, SHOWING HER EXTREMELY FINE LINES ments, is representative of much thought and study combined with practical experience gained from the running of the Lusitania, Mauretania and Carmania. Owing to the enormous size of the turbines, their maneuvering valves, steam pipes and connections, the sur- faces for heat radiation are such that the ventilating scheme had to be on a scale unparalleled in previous liners, and is the result of calculation and thoroughly scientific and practical experiment. Open type and other ing over the necessary levers by hand. The starting platform is perhaps the most interesting feature of the engine room to the non-technical vis- itor, representing, as it were, the heart of the ship from which emanates the control of all energy and motive power, for the upkeep of this floating city, and for the health and comfort of all its inhabitants. It is situated at the forward end of the center en- gine room, and is partly enclosed at the after side bv a screen. There