d?

A. No.

5. Q. If the light is properly focused, that is, if the rays are leaving
the reflector in parallel lines, but the light does not strike the
center of the track, what should be done?

A. When the light rays are thrown out in parallel lines and they do not
strike the center of the track, it denotes that the headlight case is
not set straight with the engine, and the entire case on base board must
be shifted until the shaft of light strikes the track as desired.

6. Q. What can you do to insure a good and unfailing light for the
entire trip?

A. By carefully inspecting the entire equipment before departing on each
trip, and know that there are no wires with insulation charred or worn
off, that all screws and connections are tight, commutator clean and
brushes set in brush holder in proper manner. Carbon in lamp of
sufficient length to complete trip, and that the carbon will feed
through the clutch freely and rests central over the copper electrode.
Copper electrode cleaned off, oil in both bearings and see that steam
does not blow at stuffing box gland.

7. Q. What kind of oil and how much would you use in the bearings of the
electric headlight equipment?

A. Would use the best grade of black or engine oil furnished for both
bearings and only enough oil in oil cellar that the revolving loose oil
ring may trail through the oil. When bearings are supplied with oil
cups, use a heavy oil such as good engine or valve oil.

8. Q. Why should you not use valve oil in these bearings?

A. Valve oil cannot be used successfully in the main bearing because of
its heavy body. Valve oil could not be carried up to shaft by the oil
ring in cold weather, as the ring will not revolve.

9. Q. What is the most vital part of the dynamo?

A. The commutator.

10. Q. What care or attention should be given the commutator?

A. The commutator must be kept clean, free from dirt, and the mica must
be kept filed a trifle below the surface of the copper bars.

11. Q. What kind of a bearing should the brush have on the commutator?

A. Brushes should be fitted to have a bearing with the same contour as
the commutator.

12. Q. How are the brushes fitted?

A. Brushes are fitted by cutting a strip of No. 0 sandpaper about the
width of the commutator surface (have the dynamo idle), place the
strips of sandpaper under the brush, then pull the sandpaper from left
to right; continue this process until the brush has been fitted to