Hot Springs weekly star. (Hot Springs, S.D.) 1892-1917, 1893-11-10

operation and restores the first men,
toned box to its normal or safety
position. The movement to danger.
is made mechanically and the return
movement is effected electrically by
means of a magnet in each box,
which. on being encrgized. releases a
spring that provides for the return
of the box to its normal position.
Thus an open circuit system is pro-
vided that is so constructed that
should anything happen to the source
of electrical supply no clear signal
would be given, and even should the
system become damaged or broken yet
would it be equally safe, SO far as
giving a clear or safety signal is con
cerned when danger existed.
Dcrailment Stop.
The derailment stop consists of a
lever inside the driving wheels of the
locomotive and within the trucks Of
the cars, whose lower end depends
within a few inches of the top sur,
face of the rail. 1t is pivoted so as
to permit of q movement Longitudinal
ally of the train and its upper free;
end, which extends beyond the pivot,
is connected to a link or arm, which
in turn is connected with the handle!
of a cock situated in the main train
pipe of the trains air brake system.
When the derailment takes place the
lower end is brought in contact with
the ground either by the wheels cut!
ting into the earth or by a sutficiency'
of the periphery of the wheel de-,
scending between two cross ties. By
the forward motion of the train the
lower end of this lever is vibratedi
rearwardly, the upper end moving;
%forwardly from the pivot and by its
forward motion exerting a pull upon
the link connected with the handel
of the cock in the main train pipe,
opening the same and causing the
air to escape, thus applying the
brakes.
Cooperating with this ingenious
device is the drawbridge mechanism,
which consists of a sliding rod lying
at and across the land end of the
bridge terminal, and projecting out
sufficiently to be engaged by q bracket
or arm fastened to the bridge and
moving with it. This sliding rod
has coiled upon it a spring, so ar
ranged that when relieved from the
pressure of the arm or plate it springs
out, and upon the return of the
bridge it is pushed back and the
spring compressed. Pivoted to the
cross-ties is a bell-crank whose ends
are engaged respectively by the slid!
inn p0navyonSn rod nnA n 1fnn ~ 1nn
pipe lever running parallel with the
track. This is carried back a suffi-
Gent distance and there connected
to a crank.arm, which in turn is con-
nected to a rock-shaft lying trans
versely Of the tracks, and to which
are connected at suitable places Sec
tor shaped trip-pieces, which are
raised and lowered by the rotation of
the transverse rock-shaft as the
bridge is opened and closed through
means of above-described mechanism.
These trips when in operative or
raised position, which is the position
they occupy when the bridge is
opened, engage the levers of the air
brake system, and by turning them
back apply the brakes and stop the
train. Upon the closing of the bridge
they are Of course turned down and
out Of operative position. An en-
gineer approaching an open draw
bridge first passes q signal warning
him to stop, and failing to obey it
for any reason his levers are struck
and turned back by the stops and he
comes to . .standstil upon the rails. .
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