magnet yoke, the other end being connected to the iron armature No. 64.
If, however, when the arc is formed, it is found that the bottom end of
iron armature No. 64 measures one-half inch from bottom of solenoid, the
pounding is caused by the speed of turbine engine being too slow.

24. Q. If the copper electrode was fusing, how would you know it?

A. When the copper electrode is fused, a green light is always given
off.

25. Q. What should be done when a green light is seen?

A. Immediately close off on the steam throttle until a white light
re-appears.

26. Q. What is the cause of the fusing of the copper electrode?

A. Usually too high speed of the armature, although should you connect
the wires up wrong that the current flowing from the dynamo to the lamp
should enter the lamp at the electrode instead of passing through the
carbon first, you would get a green light and fuse the electrode.

27. Q. What arrangements have been made so that you cannot connect the
wires wrong?

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