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.
30. Q. Is it possible to apply the bottom electrode holder wrong?
A. No
31. Q. Why not?
A. For the reason that its support is on a center line with the electrode and the holder can be turned in any direction and the electrode is held central with the top carbon.
32. Q. What would you do if you had no bottom electrode holder?
A. Place a piece of 5/8-inch carbon in the hole through the bottom bracket having top end in focal point of reflector and tighten with set-screw; as this carbon would burn away the light would be raised and it would therefore be necessary to raise the carbon about every hour, as the carbon would burn away about one-half inch per hour.
GENERAL QUESTIONS AND ANSWERS ON ELECTRIC HEADLIGHTS
33. Q. Describe the passage of the current through the lamp and tell how arc light is formed?