[21] U. S. FISH COMMISSION STEAMER ALBATROSS. 23 



Pounds. 



Air-pump connections 1,071 



Levers and arms 731 



Guides 843 



12 eccentric rods 1, 202 



4 "cylinder braces" (struts) 1, 104 



Link connections 295 



STEEL FORGINGS. 



4 piston-rods 1,877 



BRASS TUBES. 



2,400 drawn-brass condenser-tubes 4, 972 



COPPER PIPE. 



Steam, feed, and blow pipes 3, 458 



REVERSING GEAR. 



2 steam cylinders, valves, guides, rods, arms, &c 2,276 



CIRCULATING-PUMP. 



1 Davidson ligbt-service pump, No. 26 2,600 



ADDITIONAL WEIGHTS. 



Floor-plates, flanges, cast-iron exhaust-pipes, bolts, nuts, &c, used in fitting 



up 48,017 



No. 5 Davidson punip 1, 100 



No. 5 Davidson light-service pump 900 



Total weight of motive engines 203, 192 



BOILERS. 



There are two return-flue boilers (see Plate XVI) having a half 

 steam drum and half chimney each ; they are placed fore and aft in 

 the hold of the vessel, side by side, with the fire-room athwartships 

 and at the after end of the boilers. The axis of the chimney cuts the 

 center plane of the ship, and is between the boilers. The two half 

 chimneys are divided by a f inch wrought-iron plate, riveted to both, 

 so that the draught of one boiler is not affected by the other. Each 

 boiler has its stop-valves, feed and blow valves, checks, whistle- valves, 

 steam and water gauges, and damper complete. The boilers are covered 

 with hair felting to retard radiation. The crown sheets and flue sheets 

 are of steel ; all other portions of the boilers are of wrought iron. The 

 flues are seamless, drawn, the flue sheets being flanged to receive 

 them. The boilers are set in cast-iron chairs, and are provided with 

 cast-iron ash-pans. 



The principal dimensions of the boilers are as follow : 



Number of boilers 2 



Diameter of waist feet.. 8$ 



Length of boilers do .. 21$ 



Number of furnaces to each boiler 2 



Width of furnaces inches.. 43$ 



Length of grate bars feet.. 6$ 



Aggregate area of grate surface in both boilers do.. 95$ 



Number of 15-inch flues in each boiler 2 



Number of 12-inch flues in each boiler 2 



Number of 11-inch flues in each boiler 6 



Number of 9-inch flues in each boiler 16 



