and the
actual performance of each operation aids him to retain the
instructions.

After the first item has been covered thoroughly, proceed to the
second, etc. During the course of instruction, the user will often
interrupt with questions not dealing directly with the point being
explained. The service man should keep the user's attention on the
points he is explaining. When the service man has finished explaining
both plant and battery instruction cards, he should answer any points
in question which the user wants explained.

When the monthly equalizing charge is explained to the user, the
service man should always take the user to the battery and show him a
cell bubbling freely. This is necessary in order that the user may
recognize when the cells are bubbling freely at the time he gives the
monthly equalizing charge.

Impress upon the user the importance of inspecting each cell when
giving the monthly equalizing charge to see that every cell bubbles
freely. If a cell fails to bubble freely at the end of the equalizing
charge, the user should inform the service man of this condition
immediately.

Caution the user against the use of an open flame near the plant or
battery at any time. The gas which accumulates in a cell will explode
sufficiently to break the glass jar if this gas is ignited by a spark
or open flame.

Care of the Plant in Operation

(See also special instructions for the different makes, beginning page
460.)

The battery repairman should be able not only to repair the batteries,
but should also be able to keep the entire plant in working order, and
suggestions will be given as to what must be done, although no
detailed instructions for work on the generator, engine, and
switchboard will be given as this is beyond the scope of this book.

Battery Room. The essential things about the battery room are that it
must be clean, dry, and well ventilated. This means, of course, that
the battery and battery rack must also be kept clean and dry. A good
time to clean up is when the battery is being charged. Clean out the
room first, sweeping out dirt and rubbish, dusting the walls, and so
on. Both high and low temperatures should be avoided. If the battery
room is kept too hot, the battery will become heated and the hot
electrolyte will attack the plates and separators. Low temperatures do
no actual harm to a charged battery except to make the battery
sluggish, and seem to lack capacity. A dischar