[51] U. S. FISH COMMISSION STEAMER ALBATROSS. '53 



vance the engine ceases its motion directly the helmsman brings 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 steeriug en- 

 gine is exhausted into our maiu 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 compact. The toothed gears are rather noisy 

 when steam is used. 



D.— APPARATUS FOR DEEP SEA RESEARCH. 



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

 in position on board the Albatross. 



Nomenclature of the machine and its appointments. 



a. Cast-steel bod 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. Hiuged frame. 

 I. Cylinder of hoisting engine. 

 m. Driving pulley. 

 ». Ratchet crank. 

 o. Tighteniug-pulley. 

 p. Rope belt. 

 q. Belt tightener. 

 r. Flexible exhaust-hose. 

 s. Flexible steam-hose. 

 t. Strut. 

 m u. Castors. 

 v. Lewis holt. 

 w. 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. 



