The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

length of the engines. Worm-wheel and screw gearing driven by am elec- tric motor is supplied for turning the engines when overhauling. Two condensers, of oval form, are fitted in each engine room. The total cooling surface of the four condensers ts 32,400 sq. ft., and the total length of 5£-in. brass tubing in the condens- ers to give this cooling surface is about 38% miles. \ Contrary to the usual practice of the British admiralty, the exhaust steam from the engine passes through the condenser tubes, and is condensed by the circulating water passing over the outside of the tubes. Two centrifugal pumps in each engine room supply the circulating water, the pumps being so arranged 'that either can pump to either "or sboth condensers in one engine room. The vacuum in the condensers is maintained by two sets of twin air pumips made by Messrs. S. & J. Weir, THe Marine REVIEW ENGINES: OF THE BRITISH. CRUISER: DEFENSE, Ltd. The hot water is also drawn off by these pumps, and pumped through gravitation filters into the feed tanks. One main and one auxiliary feed pump are fitted in each boiler compartment. For making up lost water, two evap- orators, with distilling condensers, feed and 'brine pumps, etc., are also fitted in each engine room. Exclusive of the main propelling en- gines there are 56 steam engines and 40 electric motors supplied and fitted by the machinery builders throughout the ship. The boiler installation consists of 24 water-tube boilers of the Yarrow type, made by Messrs. Scotts, with a work- ing pressure of 275 lb. per square inch. They are arranged in five water-tight compiartments in the ship, with a cen- tral stokehold running 'athwartship in each compartment. The steam collec- tor of each boiler is 4 ft. 2 in. in inter- mal diameter, and 11 ft. long. The heating tubes are of solid drawn steel, 134 in. in internal diameter by about 8 ft. long, expanded at each end and headed in the thick tube plates of the steam and water drums. The Defence completed her official trials on Nov. 30, last. On the full power trial of eight hours' duration, the mean revolutions per minute were 127, and the engine indicated 27,570 H P. The Defence easily attained @ speed of 23 knots and exceeded her de- signed power by 570 I. H. P. The coal and water consumption per unit of power were also satisfactory. The vessel also ran the prescribed trials at one-fifth and four-fifths power to de- termine the radius of action. On the latter of these, of 30 hours, continuous steaming, the power approached 19,500 I. H. P, with the engines running: at 115 revolutions and a speed amounting to 20.9 knots. The results were fe garded as extremely satisfactory.