650 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [46] 



DONKEY-BOILER. 



This boiler is to be of the same material as the main boilers, is to be 

 cylindrical in form, 4 feet 6 inches in diameter, and 4 feet 8 inches in 

 length. It is to have a single furnace-line 30 inches in diameter, ex- 

 posing a grate 3 feet 3 inches long. It is to have a steam drum 24 inches 

 in diameter and 15 inches high ; the tubes are to be eight in number, 

 4£ inches in diameter, and 3 feet 9 inches long, arranged in nests over 

 the spandrels of the furnace; they are to be lap-welded drawn tubes. 

 This little boiler is to be placed on the main deck in the deck-house 

 amidships, between the main steam drum and the galley. The object 

 of using this boiler is to warm the ship, run the dynamo, run the pumps 

 (for washing decks, pumping bilge, supplying the aquaria, etc.), and 

 distilling water when the main boilers are not in use. It is believed 

 that considerable labo* and coal will thus be saved, as well as saving 

 the main boilers. 



DREDGING-ENGINE. 



The follower- bolts in the starboard cylinder of this engine, which 

 were broken a year ago by water freezing in the piston, were at the 

 time temporarily replaced by bolts belonging to another engine, have 

 been replaced by new and proper bolts. The guide-roll of this engine 

 was badly worn and scored by the dredge wire, and was replaced by a 

 new one made at the Washington navy-yard in June last. Two new 

 wrist-pins have been made for this engine. The cost for labor on the 

 above was $13.80; material, 35 cents; total, $14.15. 



REELING-ENGINE. 



This engine has been overhauled and adjusted ; the wrist-pins, which 

 were wearing "out of round," have been turned around one-fourth of a 

 turn, that the future wear may come on the high places. 



SOUNDING ENGINE. 



The steam hose on the sounding-engine burst at sea, on the 1st day 

 of May, and as there was no way of repairing it the writer substituted 

 t lie exhaust-hose for it and erected a temporary exhaust-pipe cf iron, 

 which temporary plan answered very well until the ship reached port. 

 We provided new and larger steam hose and attached them. We had 

 the steam cylinder rebored, increasing its diameter nearly one-quarter 

 of an inch, had new piston-rings made, and provided a proper oil-cup to 

 lubricate the valve and piston of this engine. The cylinder was not 

 true and the original piston-rings leaked, which diminished the power 

 of the engine, which is really too small for the work. The changes 

 made it a little better. The writer believes, when the increased pres- 

 sure from the new boilers is applied to this little engine, that it will 

 reel the wire in about 15 per cent, faster than it did originally. A new 



