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.