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ft. cooling sutface, are located ygut- board of the low-pressure cylinders, with suction pipes to two vertical air pumps 5 ft. diameter by 30-in. stroke connected to the low-pressure crossheads. on The engine frame is bu'lt of steel plates and angles in the form of box girders, so arranged that the main bearings are entirely within the frame. The wheels are of the feathering type, of the following dimensions: Diameter at center of trunnions, 26 ft; 9 in. Diameter outside of buckets, 31 ft. Diameter outside outer rim, 33 ft. Number of arms, 12. Width of buckets, 5 ft. Length of buckets, 14 ft. 6 in. Thickness of buckets, 1 in. 'Thickness of bucket reinforcing plates, % in. Curve of buckets, 9 ft. 6 in. radius. Diameter of main pins, 81% in. Diameter of rocker arm pins, 6 in. The centers are of cast iron, the arms of wrought iron, to which are bolted cast steel trunnions, the buck- ets of marine steel and rocker arms of cast steel and pins of wrought iron cased with brass working in one piece lignum- vitae bushings. Boiler Installation. Steam is supplied by ten Scotch boilers located five on each side, with center fire-room extending fore and aft. The boilers are 15 ft. 6 in. diameter ventilate engine with brackets s 4 Pee +--;;-21.0 to Base _ yo Ce of by 13 ft. 6 in. long, each having three Morrison. furnaces, 50 in, inside di- ameter, with a total grate surface of 937 sa. ft, anda': total. heating surface of 29,340 sq. ft. Forced draft is supplied to closed ash pits by four blowers; two of these blowers are 7 ft. in diameter -by 32- in. face, driven by direct-connected engines, 7 in. diameter by 10%4-in. stroke, and two blowers 8 ft. in di- ameter by 38-in, face, driven by di- rect-connected engines, 10 in. diameter by 12-in. stroke. The discharge from two blowers located in the forward compartment is led over the main deck at forward fire-room bulkhead, and the suction ducts for aft blowers lead from engine room over the main deck at aft fire-room bulkhead, leav- ing the bulkheads water-tight. -Blow- er ducts are so arranged that they room, boiler room and forward cabins as well as fur- nishing air for forced draft. A verti- cal fire tube donkey boi'er, 7 ft. 2 in. diameter, 12 ft. 5 in. high, is located on the main deck. The following pumps complete the engine installation: Four centrifugal circulating pumps, 12- in. suctions. Two boiler feed pumps, outside packed plunger, duplex 14 in. x 9 in. x 18. in. Two fire and sanitary pumps, also connected to boiler feed lines. AIL brass water ends, duplex 18%4 in. x 12 in. x 12 in: One sprinkler pump. All brass water ends, duplex 16 in. x 12 in. x 12 in. - DracRAM oF ENGINE oF STEAMER COMMONWEALTH. One bilge pump, duplex 10 in. x 8% ee 2 in, One fresh water sanitary pump, du- plex 6 in. °6. in: "x £2 Gn, One donkey feed pump, single 6 in. x 34 in. = 7 10, Two injectors for boiler feed. Two 8-ir. diameter by 15-in. stroke bilge pumps operated from main en- gine. The Electric Outfit. The electric outfit is comprised of. two 75 K, W. generators with 10%- in. by 18-in, by 8-in. engines and one 50 K. W. generator with engine 9% in, by 15 in. by 6 in., located in the engine room on the main deck, about 3,000 incandescent lights distributed throughout the vessel, a 24-in. search- light on top of pilot-house with pilot- house control, an electric elevator with a capacity of 2,000 Ibs. running from the main deck ro store-room and kitchen on dome deck, and two electric blowers located in the after hold for the ventilation of the aft cabins. All wiring engine and boiler compartments, cargo space, emigrant quarters, crew quarters, kitchen and pantries, together with all outside wiring, is in conduit with steam-tight fixtures, and all concealed wiring throughout the steamer is also run in conduit. in Particular attention has been paid fire protection and _ fire-fighting appliances. All wood work through- out the cargo space, emrgrant quar- ters, crew's quarters and on the to