[51] U. S. FISH COMMISSION STEAMER ALBATROSS. "5o 



vance the engine ceases its motion directly the helmsman brin gs his wheel 

 to rest. The slide-valve, is common to the three cylinders ; it is circu- 

 lar in form, and revolves upon its center by gearing from the steering 

 wheel ; its partitions or ribs divide it into three valves (one for each 

 cylinder), though it is one casting. The exhaust is delivered into the 

 steam-tight box which incloses the engine, and all the oil the crank-pin 

 and crank-shaft journals ever receive must come with the steam worked 

 through the cylinders. It cannot be hoped to keep the engine-box and 

 main journal-boxes tight against air-leaks, and when the steering en- 

 gine is exhausted into our main condenser we find a diminution of vac- 

 uum. The mechanical performance of the machine is all that can be 

 desired. The engine starts the moment the wheel is moved and stops 

 with equal promptness ; the power of the machine is ample and it is 

 comparatively light and comx)act. The toothed gears are rather noisy 

 when steam is used. 



D.— A.PPAEATUS FOE DEEP-SEA EESEAECH. 



Sigsbee's machine for sounding with wire is shown in Plate XXVIl as 

 in i)osition on board the Albatross. 



Nomenclature of the machine and its appointments. 



a. Cast-steel bed plate. 



b. Oak bed plate. 



c. Cast-steel frames for reel. 



d. Steel reel. 



e. Register. 



//. Guide frames. 

 g. Cap. 



h. Accumulator-pulley. 

 i. Accumulator-rope attached to pulley. 

 j. Friction rope. 

 k. Hinged frame. 

 I. Cylinder of hoisting engine. 

 m. Driving pulley. i 



n. Ratchet crank, 

 o. Tighteniug-puUey. 

 p. Rope belt. 

 q. Belt tightener. 

 r. Flexible exhaust-hose. 

 8. Flexible steam-hose. 

 t. Strut. 

 u u. Castors. 

 V. Lewis bolt. • 



tv. Brace. 

 XX. Guys. 

 y. Guide pulley. 

 z. Auxiliary brake. 



The machine is placed on the port side of the topgallant forecastle, 

 near the after end, and is rigged for reeling in. 



