[49] 



U. S. FISH COMMISSION STEAMER ALBATROSS. 



51 



■with 10 or 12 pounds of steam per square inch of piston, and for this 

 reason we pliiced a pressure-regulating valve (Fig. 18) in the steam- 

 pipe; by tightenning or slacking the screw we can adjust the steam in 

 the cylinder to any pressure inside the limit of the boiler pressure. 



Fig. 18. 



The engine takes its steam from the main boilers, and exhausts 

 the main condenser or into the atmosphere, as desired. 



The principal dimensions of the steam windlass are as follow: 



Diameter of the windlass shaft inches . . 



Smallest diameter of the gipsy heads do 



Largest (inboard) diameter of the gipsy heads , do 



End (outboard) diameter of the gipsy heads do 



Length of the gipsy heads do 



Number of whelps on the chain-holders 



Size of the starboard chain (diameter of iron) inches.. 



Size of the port chain (diameter of iron) do 



Chain per revolution of the starboard chain-holder fathoms.. 



Chain per revolution of the port chain-holder do 



Diameter of the friction-brakes inches.. 



Width of face of the friction-brakes do 



Total length of the windlass shaft do 



Number of teeth in the bevel spur-wheel do.... 



Number of teeth in the bevel pinion 



Number of teeth in the spiral gear-wheel 



Number of convolutions of the " worm " screw thread 



Outer diameter of the worm screw inches.. 



Radial length of the worm-screw threads do 



Pitch of the spiral gear do 



Diameter of the capstan spindle do 



Smallest diameter over the capstan whelps do 



Projected height of the capstan drum .do 



Number of steam cylinders 



Diameter of the steam cylinders inches.. 



Stroke of the pistons do 



Diameter of the piston rods do 



Diameter of the connecting rods at the neck do 



Diameter of tlie crank pin do 



Length of the crank-pin journal do 



into 



3f 

 10| 

 15 

 13* 

 131 



I 



f? 

 23 



92 



49 

 12 



52 

 4 



8 



ii 



it 



10f 



14 



2 



1* 



2i 

 6 



