PYLE-NATIONAL ELECTRIC HEADLIGHT
1. Q. Why are electric headlights applied to locomotives?
A. Electric headlights are applied to locomotives so that the engineer may have a clear view of the track for enough ahead of the train to enable him to protect the company's property in his charge.
2. Q. How far ahead of the engine should the arc headlight illuminate the track?
A. Not less than from fifteen to twenty telegraph poles.
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?