ading on the nameplate.
2. Wrong setting of the brush rocker arm. This causes sparking,
which soon will cause excessive heating.
3. Rough commutator. This will cause the brushes to chatter, be
noisy and spark. Caused many times by allowing copper to accumulate
on the bottom of the brushes.
4. Insufficient pressure on brushes, resulting in sparking. This
may be due to brushes wearing down to the point where the brush
lead screw rests on the brush holder.
5. Dirt and grease accumulating between the brush and brush holder
causing brush to stick; brush must always move freely in the holder.
6. Brush holder may have come loose, causing it to slip back,
relieving brush press-Lire.
7. Brush spring may have become loosened, releasing the tension.
8. Watch commutator carefully and keep it in the best of condition.
There will not be excessive heating without sparking. Excessive
sparking may raise the temperature so high as to cause throwing of
solder. You can avoid all this by taking proper care of the
commutator.

C. Ammeters on Panels Read Reverse: This is caused by improperly
connecting up batteries, which has reversed the polarity of the
generator. This generally does no harm, since in most cases the
batteries will automatically reverse the polarity of the generator.
Generally the condition may be remedied by stopping the machine,
reversing the batteries and starting the machine again. If this is
unsuccessful raise the brushes on the machine. Connect five or six
batteries in series in the correct way to one panel, while the machine
is not in operation. Turn on the panel switch. When the machine is
started, it will then build up in the right direction. If it does not
do so, repeat the above, using a larger number of batteries.

D. Machine Refuses to Start. If there is a humming noise when you try
to start the motor, and the outfit does not start, one of the fuses
needs replacing. The outfit will hum only on two or three phase
current. Never leave the power turned on with any of the fuses out.

Constant-Potential Charging

In the Constant-Potential system of battery charging, the charging
voltage is adjusted to about 7.5, and is held constant throughout the
charge. With this system a discharged battery receives a heavy current
when it is put on charge. This current gradually decreases as the
battery charges, due to the increasing ba