LOCOMOTIVE ENGINE. 



461 



supply the bearing, and in it is cast the socket C, in which the end of the spindle 

 attached to the spring rests. The inside of the box is octagonal at the top, as shewn 

 in fig. 39, and has the brass 

 piece D D fitted into it ; which 

 is turned out in the inside to 

 fit the end of the axle, reaching 

 down to the centre, and having 

 a small projection, E, on each 

 side, which fits ^nto a corre- 

 sponding notch in the sides of 

 the box A A, and serves to hold 

 the brass steadily. Two thin 

 brass tubes, F F, are screwed 

 into the brass, and pass through 

 holes in the top of the box A, 

 projecting up into the hollow 

 B, containing oil ; and cotton 

 thread is put into them, dipping FIO. 40. 



into the oil and touching the axle at the other end, acting like a syphon in furnishing 

 a constant supply of oil to the axle, as in the oil cups before described. The bottom is 

 closed by the cast iron piece G Cr, made tapering to fit closely to the sides of the 

 axle box, and held in by the bolts H ; and hollowed in the inside so as to clear the 

 axle, the position of which is shewn by the dotted lines. A piece, //, is cast on each 

 side of the box, projecting half an inch, which fits exactly between the two axle 

 guide plates, and slides between them; as shewn in the plan, fig. 40, where K K is 

 a horizontal section of the axle guides ; L L are pieces of iron plate bent so as to 

 fit accurately between the plates K K, and bolted to them, as shewn in Plate XCII. ; 

 the faces of the pieces // bear against them, and they are both made true and 

 smooth^ so as to allow the axle box to slide up and down easily and without shaking. 

 The top of the box is covered by a piece of sheet iron, with a hole in it for the 

 spindle of the spring, in order to protect the oil. 



S' S' S' are the springs, made as usual of separate steel plates ; those for the driving 

 wheels, D', are the strongest, consisting of thirteen plates, 4 inches wide, and five 

 sixteenths of an inch thick ; the other springs are 3 inches wide, the front ones having 

 twelve plates and the hind ones eight. The four small springs are placed under the 

 outside frame, and their ends rest in sockets x V, fixed to the frame, and are kept 

 in by bolts put through the sockets. The larger springs are turned over at the 

 ends and take hold of short bolts, having the links y y fixed on them ; the lower ends 



