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MARINE REVIEW. VoL. XI. CLEVELAND, O., APRIL 25, 1895. No. 17. Engines of One of England's Greatest New Battleships. One of the twin sets of triple expansion engines to be fitted in the new British battleship Magnificent, which belongs to the largest class of war vessels yet constructed, is illustrated on this page. It is expected that the Magnificent will be ready for trial in a few months. Her dis- placement is 14,900 tons, of which 10,180 tons is due to the weight of the hull. The length is 390 feet, the beam 75 feet, and the mean load draft 27 feet 6 inches. This machinery, which was built by John Penn & Sons, Greenwich, is to develop 12,000 indicated horse power with induced draught and 10,000 indicated horse power with natural draught, the speeds at these powers being 1714 and 1634 knots respectively. In view of the great in- ia. e Z is eu iti Im aun x mn lie iii | mn | i ae as --_ connecting rods are of Siemens-Martin steel, the piston rods being fitted with combination metallic packing. The crank-shafts are hollow, of forged steel, in three separate pieces, the cranks being set at 120 degrees. The propeller shafting is hollow, of forged steel, 143/ inches in diam- eter inboard and 16 inches in diameter outside the ship. The propellers are of gun metal, four-bladed, and are 17 feet in diameter by 19 feet 9 inches pitch. The surface condensers are made entirely of brass, the total cooling surface being 13,500 square feet. The circulating water is supplied by four 10-inch centrifugal pumps. Air pumps are entirely of brass, and are worked from the low pressure piston-rod crossheads; they deliver into a feed tank which overflows into the ship's fresh water re- serve tanks. Evaporators, distillers, auxiliary condensers, electric light ENGINES OF ONE OF THE LARGEST WAR VESSELS AS YET CONSTRUCTED. terest attached to weights in ships of this kind, and to the fact that the framing is so distinctly shown in the engraving, it may be interesting to state that the bedplate, which is of cast steel and strongly secured to bearers built into the ship, weighs thirty-six tons, and the standards and guides forty-six tons, a total of eighty-two tons. The back columns are of cast iron, while forged steel is used in the front columns, the motion bars being attached to the back columns. The engines have cylinders 40 inches, 59 inches and 88 inches in diameter respectively, all with 51 inches stroke. The high pressure cylinders are placed forward, and are fitted with piston valves, while the intermediate and low pressure slide valve are of the double flat-valve type. The reversing gear is of the or- dinary link-motion type, with solid bar links and adjustable working parts. Both steam and hand reversing gears are fitted. The cylinder covers, pistons and steam chest doors are of cast steel. The piston and machinery, air compressing machinery and boat hoisting machinery are among the auxiliaries. As this is the first large naval coldest to which Martin's system of in- duced draft is to be applied, results of speed trials will be watched with special interest. The principle of this draft arrangement is well known, fans being placed in the uptake, where they tend to create a partial vacuum. The boilers are eight in number, of the marine return-tube type, 16 feet 1 inch in mean diameter, and 9 feet 3 inches long, each con- taining four Fox corrugated furnaces 3 feet 8 inches in mean diameter. They are of Siemens-Martin steel throughout, and are designed for a working pressure of 155 pounds per square inch, and a proof pressure of 245 pounds per square inch. The heating surface is 25,248 square feet, and the grate area 855 square feet. The engraving and description of machinery are taken from Engineering of London.