[67] U. S. FISH COMMISSION STEAMEE ALBATROSS. 69 



NOMENCLATURE. 



a. Cylinder. 

 b b. Frame. 

 c c. Clamps to secure apparatus to temperature rope. 



d. Expansion chamber. 



e. Cock. 

 //. Guards. 



g g. Propellers. 



lih. Shafts. 



i i. Sleeves. 



j j. Guys. 



k k. Slots. 



1 1, Valves. 

 TO m. Valve seats. 



n n. End pieces. 



0. Spanner holes. 



p p. Spanner boles. 



q q. Set screws. 

 r r r. Stay rods. 



8 s. Inner arms of propeller frames. 

 1 1. Outer arms of propeller frames. 



u u. Cylinder clamp. 



V V. Pin for cylinder clamp. 



All parts of this water bottle are of brass, except the propeller blades, 

 which are of German silver. The cylinder is a tube of commercial pat- 

 tern ; the frames, valves, valve seats, &c., are cast brass. 



PKEPAKATION FOE USE (PLATE XXXVl). 



Cleanse the inside of the cylinder from all foreign substances, particu- 

 larly verdigris, oil, or red lead, which is sometimes used for making joints. 

 Clean the valve faces and valve seats with a soft cloth, avoiding brick- 

 dust, emery paper, or other scouring substances, as the valves are very 

 carefully ground in and any scratch on their faces renders them liable 

 to leak. 



The valve seats should be removed for cleaning and replaced again, 

 using spanners in the holes o p for the purpose, and to insure tight 

 joints without undue strain a little red lead may be used on the shoul- 

 der between m and n. 



In cleaning the cylinder particular attention should be given to the 

 cock e and the expansion chamber d. 



The propellers should be examined to see that they work freely on 

 the sleeves and the supporting screws on their outer extremities. The 

 shafts should be run up and down by means of the milled heads at fc, 

 to ascertain if the screw threads work freely and the shafts move on 

 their bearings without undue friction. 



The propellers should then be moved outward until they clear the 

 supporting screws, where they will revolve freely during the descent 

 without moving the shafts or in any waj' affecting the valves. The 

 shafts should then be screwed inward a little to allow free connection 

 with the valve stems I. 



