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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