24. Q. Why not?
A. Because there is no top guide to the carbon, as the carbon is guided by the clutches.
25. Q. How many levers are there in the lamp?
A. Only one.
26. Q. What regulation should be given to top lever spring No. 308 on lamp?
A. Top lever spring No. 308 should be adjusted as loose as possible and not have light go out standing still.
27. Q. If this spring was tightened until the light burned steady when the locomotive was at rest, what might occur when engine was running high speed?
A. It might cause the light to dim down.
28. Q. Is there anything else that would cause the light to dim down when the engine is running fast?
A. If the clutches should be used until the sharp edge that grips the carbon have become worn smooth or round they would allow the carbon to feed too fast and the light would burn dim.