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MARINE REVIEW. | 89 Engines of the Steamer Boston. The steamer Boston of the Yarmouth line is probably the fastest freight steamer entering the port of Boston. She has attracted a great deal' of attention on account of her engines, an engraving of which is herewith presented through the kindness of the editor of the American Shipbuilder, New Vork. "The vessel is a remarkable one," Says the Shipbuilder, 'because the task put before the builders was very difficult. 'The length of the ship was restricted to 245 feet and only a light draft was © admissible. A dead weight of 250 tons was to be carried at a speed of 17 knots and forced draft was not to be used, and only a single screw. The result was more than satisfactory, for on _ trial on the measured mile with all her dead weight on board a mean speed of 18.22 knots was made. 'The steamer is built of mild steel, 245 feet between perpendiculars, breadth 36 feet, depth from awning deck 21 feet,with a shade deck above extend- 4 in Rtg changable and reversible pieces, and has six extra long bearings on the bed-plate lined with white metal. All the surfaces of the several working parts are large, and attention has been given to the lubricating arrangements, the crank pins having centrifugal - lubricators. There are are two air pumps, each 23 inches in diameter by 15 inches stroke, worked by levers from the high- pressure.engine. The condenser is separate from the engines, aud stands on wrought iron stools, built up from the ship's floors "It contains 7,000 square feet of cooling surface, and is made of mild steel plates with cast iron ends. There are two » separate and independent centrifugal circulating pumps; separate bilge and ballast pumps, and the feed pumps ate~dtitomatically controlled from the float tank. Steam is supplied at a pressure of 160 pounds per square inch by one single-ended and two double-ended boilers. The former is 11 feet' long, "dnd -.: the latter 18 feet 3 inches, and the three are each 14 feet 6 inches : in diameter. 'There are in all fifteen Purves patent ribbed fur- laces, each 3 feet 6 inches in diameter. 315 feet, and the heating surface 10,300 square feet. E _Y eB U iM! MW | | | , x ] ENGINES OF THE STEAMER BOSTON. ing the whole length and breadth of the ship and up to which the sides of the vessel are carried, except for a length of ten feet at the stem. 'The vessel is schooner rigged and has two funnels. She was built by Alex. Stephens & Son of Linthouse, Glasgow. 'The engraving is a front view of the engines, which are triple expansion, having cylinders 34, 51 and 84 inches in diam- eter, by 36 inches stroke. 'They were specially designed to combine lightness with the strength and rigidity necessary in a high speed engine running continuously. The cylinders are sup- ported by V-shaped columns of cast iron, spread out longitudi- nally and laterally to give great stability. The high pres- sure cylinder is fitted with a piston valve and the intermediate and low préssure cylinders have double ported slide valves. The valves are operated by: ordinary link motion, the reversing gear. being of the all round type. The pistons are of cast steel, while the piston rods are ingot steel. The crank shaft is built of ingot steel, the webs being wrought iron. It is in three inter- Steam. Whistle at Point Betsy. The January bulletin from the light-house board regarding changes in aids to navigation, notes the establishment of a 10-inch steam whistle at Point Betsey light station, east shore of Lake Michigan, 'The characteristic of the signal is blasts of 5 seconds duration, separated by alternate silent intervals of 10 and 4o seconds. 'The fog signal house stands about 175 feet N. HE. by N. from the light tower. It is a corrugated iron structure painted dark brown. The company which is to operate a line of whaleback . steamers between Gladstone and Buffalo will be known as the Minneapolis, St. Paul and Buffalo Steamship Company. The incorporaters are W. D. Washburn, John §. Pillsbury, B. B. Langdon, F. D. Underwood, Thomas Lowry and C. E Wales. Board of directors, W. D. Washburn, Thomas Lowry, B.-. B: - Langdon, John Martin and F. D. Underwood. The caryital stock is $500.coo. The total grate areais