"cocked up" as
left by some repair man. Open the dynamo door and see that the brushes
bear on the copper commutator. A wire may be loose at the dynamo binding
posts (which may be seen when the dynamo door is open), or at the main
switch in the cab. A main wire may have broken. (All locomotives are not
equipped with fuse plugs.) A fuse plug may have become loose or burnt
out. Replace with new fuse plugs or break an incandescent lamp and twist
the leads in the base together, when the base may be screwed into the
fuse plug socket, answering the purpose of a fuse plug, temporarily.

(c) =Headlight fails to burn.= Examine the wires between cab switch and
head lamp for breaks or disconnections. Examine fuse plugs (which are
sometimes in head lamp circuit only) and proceed as in (b) if trouble is
found there. Headlight bulb may not be screwed in far enough to make
contact in the socket, as the lock-sockets provided to prevent lamps
loosening cause lamp to screw in hard. Lamp may have broken fillament.
Replace with proper type of lamp or use a cab lamp.

(d) =Lamps burn dim.= Steam valve not open wide enough. Boiler pressure
too low. Brushes sparking badly on commutator of dynamo--due to poor
contact. Governor or steam-valve of turbine improperly adjusted.

(e) =Lamps burn too brightly.= Improper turbine regulation. Throttle the
steam valve in cab until lamps are reduced to proper brilliancy. Report
all irregularities on arriving at terminal.

=SCHROEDER HEADLIGHT=

1. Q. What is the speed of a Schroeder headlight dynamo?

A. About 2,800 revolutions per minute.

2. Q. How is the speed altered?

A. By a governor in the turbine.

3. Q. How would you proceed to change the speed of the governor?

A. Remove cover No. 3 and loosen lock nut No. 14 and turn nut No. 13 to
the right to increase the speed and to the left to decrease it.

4. Q. What is a short circuit?

A. A connection between the positive and negative wires of the dynamo
without any resistance between.

5. Q. How does the dynamo act when short-circuited?

A. It will run very slowly as it is under a heavy strain.

6. Q. What would be the result if left to run under that strain?

A. The armature or fields would burn out.

7. Q. What would you do if a short circuit developed while on the road?

A. Shut the steam off and remove the positive or right-hand wire of the
cab circuit from the dynamo, start up and see if the headlight went to
work prope