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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 
fig. 39, and has the brass 
m 
Fig. 38. 
Fig. 40. 
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 into a corre 
sponding notch in the sides of 
the box A A, and serves to hold 
the brass steadily. Two thin 
brass tubes, F E, 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 
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 G, 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. Apiece, II, 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 К К is 
a horizontal section of the axle guides ; L L are pieces of iron plate bent so as to 
fit accurately between the plates К K, and bolted to them, as shewn in Plate XCII.; 
the faces of the pieces II 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 x, 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 у у fixed on them ; the lower ends