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.
29. Q. If the light burns satisfactory while engine is in motion, but
goes out when engine is stopped, where would you find the trouble?
A. This trouble is most always found to be caused by the top lever
springs No. 308 being too weak; or, an imperfect carbon, though if the
dash pot plunger has become corroded until it sticks in the dash pot,
the light will act the same as if the tension spring was too weak.