A. Yes; if the spring No. 92-A that hold the heel of the clutch should
be too weak, the heel of the clutch would be forced up by the motion of
the locomotive; this would release the carbon which would fall to the
point of the copper electrode, causing the light to dim down, or, if the
clutch should be used until the sharp edge that grips the carbon should
have become worn smooth or round, the same would occur.

21. Q. If the light burns satisfactorily while the 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 tension spring
No. 93 being too weak, 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 were too weak.

22. Q. If the dash-pot should be found stuck, would you put oil in it?

A. Coal oil could be used to clean and cut the dirt out of the pot and
from off the plunger, but after the dash-pot and plunger have been
cleaned, all oil must be wiped off, for oil would cause the plunger to
stick as well as collect dirt.

23. Q. If the carbon of lamp should "jig or pound", what can be done to
stop it?

A. If the carbons pound the electrode, it is evidence that the iron
armature No. 64 may be too far out of the solenoid, or the speed of the
turbine engine may be too slow. This trouble can be remedied by adding
another link to the suspension link, which has one end connected to the