14 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [12] 



used, and the engine exhausts into the atmosphere through the escape 

 pipe of the main safety-valve. There is a pan of sheet-lead fitted under 

 the engine to receive all dripping oil or water. 



Boiler is an overhead, return-Hue boiler, 8^ feet front, 8i feet diam- 

 eter of waist, and 21.] feet in length, with water-leg furnaces; two fur- 

 naces, G feet 8 inches long, by 3i feet wide; grate surface, 46.G square 

 feet; main flues, three of 11 inches diameter, one of 12 inches, and one of 

 IT) inches for each furnace; return flues in two tiers, seven flues of lOi 

 inches diameter in each tier. The flues are welded and drawn. All out- 

 side seams, seams of steam chimney, and water-legs double riveted. 

 Flat surfaces are braced with seven-eighth inch socket-bolts 7^ inches 

 from center to center. Thickness of circular part of shell is five-six- 

 teenths inch; water-legs three-eighths inch; steam chimney of mild steel 

 five-sixteenths inch. Fire-box and crown-sheets are also of mild steel, 

 three-eighths inch thick; heads of shell and flat surfaces three-eighths 

 inch. There are the necessary man-holes and hand-holes and double 

 turnace doors. The boiler has been tested by a hydrostatic pressure of 

 65 pounds per square inch. The legs of the furnace part of the boiler 

 rest upon cast-iron chairs set outside of ash pans, aud under the waist 

 is a cast-iron saddle. The boiler is held in place by turnbuckle bolts. 

 Under the furnaces are cast-iron pans, made in one width, for each fur- 

 nace; bottom of pans five-eighths inch aud one-half inch thick for all 

 flanges. Ash pans have a long, beveled front flange, projecting 15 inches 

 •from front of boiler to catch dropping fire and cinders. Grate-bars are 

 of cast iron in two lengths, three-fourths inch thick on face and five-six- 

 teenths inch at lower edge, with five-eighths inch air spaces. Boiler shell 

 and steam chimney are covered with hair felt, and wool backing Ih 

 inches thick. Main and all other steam pipes are covered with hair felt 

 i inch thick, with canvas backing, and painted. 



Boiler attachments. — There are attached to the boiler, one steam stop- 

 valve 7 inches diameter, one safety-valve G inches diameter, with coniiec 

 tious to engine-room, and copper escape-pipe, IG feet long; one bottom 

 blow-valve 2i inches, one surface blow-valve 2 inches, two check-valves 

 2^ inches, and one screw stop-valve, each for auxiliary aud circulating 

 pumps. All these valves are of composition, with composition glands 

 and stems; also four brass gauge-cocks, glass water-gauge 15 inches long 

 and salinometer. 



Smoke-pipe and casing. — The smoke-pipe is 42 inches diameter and 21 

 feet high, in three lengths of 8 feet each; flush jointed, 2|-inch angle 

 iron at top, and band 2^ by % inches at bottom. Pipe is made of iron 

 No. 14 wire gauge, and is fitted with a proper damper. There is a cas- 

 ing around lower j)art of pipe and top of steam-drum, extending above 

 the hurricane deck 2h feet, made of iron No. 12 wire gauge, and fastened 

 to deck with angle-iron; casing covered by an umbrella. There are six 

 stays to smoke j>ipe of wire rope nine-sixteenths inch in diameter, and 

 secured to deck bv eve bolts. 



