[33] FISHERIES OF THE UNITED STATES. 545 



The condenser is common to both engines and forms their framing. 

 The upper ends of the cylinders are drawn inboard over the condenser, 

 making the engines slightly inclined. 



The condenser has an aggregate of 2,150 square feet of condensing 

 surface. There are two horizontal air-pumps, an independent circu- 

 lating pump, two main feed-pumps, and two auxiliary pumps, which can 

 be used as feed-pumps for fire purposes, or for bilge-pumps. 



There are two overhead return-flue boilers, 8£ feet in diameter, 21^ 

 feet long, with 93 square feet of grate surface, a steam chimney 7 feet 

 4 inches in diameter outside and 14 feet high above the shell. 



The ward-room, next aft of the engine department, has eight state- 

 rooms with bath-room and pantry. The navigator's, paymaster's, and 

 ward-room store-rooms are in the hold below these quarters. In the fore 

 hold are the water-tanks, bread-room, sail-room, steerage and engineers' 

 store-rooms, cold-room, and ice-house. Forward of the collision bulk- 

 head are the boatswains' and dredging store-rooms, the magazine, &c. 



The special engines of the ship are as follows, viz: 



A Providence steam windlass and capstan, built by the American Ship 

 Windlass Company, of Providence, Ehode Island. 



A hoisting engine for dredging, on the spar-deck forward of the fore- 

 mast ; a reeling engine on the berth-deck below the former for reeling 

 up the dredge-rope. Both were built by Copeland & Bacon of New 

 York. 



Higginson & Company's steam quartermaster, built by the Pusey 

 and Jones Company, is placed in the pilot-house and can be used either 

 as a hand or steam steering gear. 



Wise's steam motor attached to a Sturtevant exhaust-fan for venti- 

 lating the ship. 



Ash hoister, designed by Passed Assistant Engineer G. W. Baird, 

 United States Navy. 



Svedberg's marine governors attached to the main engines. 



Edison's dynamo and engine for electric lighting. 



Heat is provided by steam radiators in all inhabited parts of the 

 ship. 



Ventilation is secured by means of conduits leading to all parts of 

 the ship, through which air is drawn by the exhaust fan above men- 

 tioned, which is placed on a platform in the fire-room and arranged to 

 discharge downward in the direction of the furnaces. 



Light is provided by 120 8 candle B lamps of the Edison incandescent 

 system, and a Z dynamo driven by an Armington and Sims high-speed 

 engine. These lamps are distributed to all parts of the ship, including 

 holds and store-rooms, and there are twelve lamps outside for lighting 

 the deck. 



In the laboratories the lamps are especially numerous and quite suf- 

 ficient for any probable needs. An arc lamp of great power, designed 

 by Dr. O. A. Moses, to work in circuit with the Edison incandescent 

 2444— Bull. 27 35 



