ng
valve lever 10 to center position. Sixth, open valve 6 sufficiently to
run left elevator to ascertain if it operates freely. Cut in right
elevator by lowering pawl shifter 26, and if stoker stops, the
obstruction is in the right elevator. If it continues to operate, then
the obstruction is in the tank conveyor.

25. Q. How would you remove clogs?

A. Clogs in upright elevators usually occur at the bottom. Raise the
door in the engine deck and remove the obstruction if in the elevator,
reverse the elevator screw forcing the obstruction back down in transfer
hopper. It may be a small mine spike lodged above this point, and by
removing the nut at top of elevator casing and removing the door the
obstruction can be easily removed.

26. Q. If the clog is in the tank conveyor, how would it be removed?

A. The clog will usually be found in the crushing zone. Reverse the tank
conveyor screw, forcing the obstruction back, when it can be removed
from the trough.

27. Q. How far should the conveyor screw be run backwards?

A. Not more than three revolutions.

[Illustration]

PARTS OF DUPLEX LOCOMOTIVE STOKER
1. Conveyor Trough.
2. Conveyor Screw.
3. Angle Ring.
4. Crusher.
5. Operating Head.
6. Driving Engine Cylinder.
7. Reverse Valve.
8. Piston Rod.
9. Transfer Hopper.
10. Left Elevator Casing.
11. Left Elevator Screw.
12. End of Elevator Screw Shaft.
13. Elevator Pawl Shifter.
14. Elevator Pawl Casing.
15. Distributors.
16. Left Distributor Elbow.
17. Right Distributor Elbow.
18. Dividing Rib.
19. Right Elevator Casing.
20. Oil Box.
21. Conveyor Reverse Lever.
22. Conveyor Oil Cups.
23. Rack Housing.
24. Rack.
25. Conveyor Pawl Casing.
26. Conveyor Screw Flexible Connection Sleeve.
27. Conveyor Screw Flexible Connection.
28. Conveyor Slide Support Roller.
29. Conveyor Slide Support.
30. Conveyor End Bearing and Gear Case.
31. Conveyor Screw Gear.
32. Conveyor Screw Driving Gear.

=AIR BRAKE QUESTIONS=

COMPRESSOR GOVERNOR

1. Q. When steam is first turned on, what must it pass through before
entering the compressor?

A. The compressor governor.

2. Q. What does Fig. 1 represent?

A. This shows a sectional view of the SF compressor governor in open
position.

3. Q. What is the duty of the compressor governor?

A. To automatically regulate the main reservoir pressure by controlling
the steam to the compressor.

4. Q. How are the regulating portions of the governor designated