A. The positive binding post both at the dynamo and lamp have been provided with a much larger hole to receive the wire than has been made in the negative binding post, and the ends of the positive wire should always be bent or doubled back so they will just enter the receptacle in the positive binding posts, but cannot be connected to the negative binding post.

57.  Q. Should the copper electrode and holder become fused until no longer serviceable out on the road, what would you do?

A. Would remove the damaged holder from the lamp and substitute a carbon, securing the substituted electrode in the bracket of lamp same as the electrode holder is held.  Be sure that the end of the carbon comes up to center of reflector and does not rest on base of reflector or lamp.

58.  Q. If you were running along with your light burning steady and nice, then suddenly the light began to flash badly and kept it up, where would you look for the trouble?

A. You would no doubt find one of the lead wires loose in binding post.

59.  Q. If you were running along with light burning satisfactorily and suddenly your light went out, where would you be likely to find the trouble?

A. You would undoubtedly find carbon burned out, or a lead wire was broken off or out of the binding posts.

60.  Q. If the light goes out while between stations, what course would an engineer pursue?

A. If investigation cannot be made within a few minutes thereafter to determine the cause, the steam should be shut off from the turbine engine until such time when cause of failure can be determined.

61.  Q. Why is it essential to shut off steam and stop the equipment?

A. If failure was due to a short circuit, damage might be done to the armature or field coils by overheating.

62.  Q. How does the equipment act when short circuited?

A. The engine will labor heavily and run slowly with a large volume of steam blowing at the exhaust, the carbon points and cab lights will only show a dull red light.

63.  Q. How would you test for a broken circuit?

A. Would test for a broken circuit or open circuit:  First, by placing a carbon across the binding posts at dynamo.  If the trouble was in the dynamo, no flash would be seen, but if dynamo was all right you would get a flash; this would indicate that the trouble was on towards the lamp.  Second:  Go to the lamp, place your carbon across binding posts.  If wire was broken between dynamo and lamp you would not get a flash.  If your wires were all right you would get a flash and you would find your trouble in the lamp.  No doubt, it would be a burned-out carbon.

64.  Q. How would you proceed to locate the point of trouble with a short circuit?