3. Q. State how you would focus the lamp.

A. First, would adjust back of the reflector so front edge of reflector

will be parallel with front edge of case. Second, adjust the lamp to

have point of copper electrode as near the center of reflector as

possible with carbons as near the center of the chimney holes as you can

set them. Third, have the locomotive on straight track. Now move the

base of the lamp around until you get a parallel beam of white light

straight down the center of the track, then tighten the lamp down.

4. Q. If the light throws shadows upon the track, is it properly

focused?

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.

The Traveling Engineers' Association to Improve the Locomotive Engine Service of American Railroads Examination Questions and Answers for Firemen for Promotion and New Men for Employment · 第 226 / 436 题