s all right you would
get a flash; this would indicate that the trouble was on towards the
lamp. Second: Go to the lamp, place your carbon across binding posts. If
wire was broken between dynamo and lamp you would not get a flash. If
your wires were all right you would get a flash and you would find your
trouble in the lamp. No doubt, it would be a burned-out carbon.

64. Q. How would you proceed to locate the point of trouble with a short
circuit?

A. Would remove (1) one of the lead wires from the binding post at
dynamo; if trouble was in dynamo you would not note any difference in
action of speed. (2) Would disconnect one of the cab wires; if the
trouble is in cab circuit, speed would increase and lamp would burn. (3)
If trouble is not in cab circuit, would go to lamp, disconnect one of
the main wires from binding post; if short circuit is in the wires
between dynamo and lamp, there would be no change in speed of dynamo,
but if the wires are O. K. the speed of engine would increase and your
trouble would be in the lamp.

=DUPLEX LOCOMOTIVE STOKER=

1. Q. Of what does the driving mechanism of a Duplex Locomotive Stoker
consist?

A. It consists of a steam cylinder with reverse head and valve
arrangement similar to the steam end of an eleven inch Westinghouse air
pump.

2. Q. How is the power controlled?

A. The speed is variable, and by turning the valve controlling the
engine steam inlet, can be made greater or less according to the amount
of coal needed.

3. Q. For ordinary operation, how much steam pressure is required?

A. About fifteen pounds, with piston strokes varying from 10 to 15 per
minute.

4. Q. How can the duplex stoker driving engine be started, stopped, or
reversed?

A. By means of operating and reversing rod, fastened to the back head
and connected with the valve on reverse head of engine cylinder.

5. Q. How can the conveying screws be started, stopped, or reversed
separately or together?

A. By ratchet and pawl arrangement controlling each.

6. Q. What practice should be followed in building up the fire before
leaving a terminal?

A. Build up a light even fire by hand and do not bring stoker into use
until the locomotive is working steam.

7. Q. How should the stoker be oiled and operated?

A. It should be thoroughly oiled before leaving the terminal, then see
that operating rod on back head is in center or running position, open
main jet line so they register about fi