[4^] 



U. S. FISH COMMISSION STEAMER ALBATROSS. 



il 



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

 reason we j^laced a pressure-regulating- valve (Fig. IS) 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 into 

 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 . . 3f 



Smallest diameter of the gipsy heads do 10^ 



Largest (inboard) diameter of the gipsy heads do 15 



End (outboard) diameter of the gipsy heads do l^i 



Length of the gipsy heads do 13^ 



Number of whelps on the chain-holders 5 



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



Size of the port chain (diameter of iron) do l-i\. 



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



Chain per revolution of the port chain-holder do |9 



Diameter of the friction-brakes inches.. 23 



Width of face of the friction-brakes do 2^ 



Total length of the windlass shaft do 92 



Number of teeth in the bevel spur-wheel do 49 



Number of teeth in the bevel pinion 12 



Number of teeth in the spiral gear-wheel 52 



Number of convolutions of the " worm " screw thread 4 



Outer diameter of the worm screw inches.. 8 



Radial length of the worm-screw threads do 1:^ 



Pitch of the spiral gear do If 



Diameter of the capstan spindle do 3^% 



Smallest diameter over the capstan whelps do lOf 



Projected height of the capstan drum do 14 



Number of steam cylinders 2 



Diameter of the steam cylinders inches.. 8 



Stroke of the pistons do 8 



Diameter of the piston rods do If 



Diameter of the connecting rods at the neck do 1^ 



Diameter of the crank pin do 2f 



Length of the crank-pin journal ....,.,.,. ., . .do.,,, 6 



