ed cells and charge at normal
rate already indicated under "charging rates" until dell voltage reads
2.5 or above, at 80 deg.. The positive to cadmium voltage should be at
least 0.10 volts less than cell voltage itself. When this condition is
obtained cell may be replaced in operating circuit with others and
should give satisfactory service.

EXIDE FARM LIGHTING BATTERIES.

Exide Farm lighting Batteries are made with sealed glass jars, open
glass jars, and sealed rubber jars, each of which will be described.

Batteries with Sealed Glass Jars.

Two types with sealed glass jars are made, these being the Delco Light
Type, and the Exide type.

1. Delco-Light Type. This type is shown in Fig. 294. The cell shown is
a pilot cell, there being two of these in each battery as explained
below.

These cells are made in two sizes, the KXG-7, 7 plate, 80 ampere hour
cell, and the KXG-13, a 13 plate, 160 ampere hour cell. These cells
are assembled into a 32 volt, 16 cell battery, or a 110 volt, 56 cell
battery.

The plate groups are supported from the cover, the weight being
carried by the wooden cover supports as shown in Fig. 294. The strap
posts are threaded, and are clamped to the cover and supports by means
of alloy nuts, just as is the case in Exide automobile batteries.

A hard rubber supporting rod or lock pin extending across the bottoms
of the plates holds the separators in position and prevents the plates
from flaring out at the bottom. A soft rubber bumper fastened on each
end of the rod acts as a cushion to prevent jar breakage in shipping.

The hard rubber cover overlaps the flanged top of the jar, to which it
is sealed with special compound.

Battery Gauges and Instruments for Testing.

Every set of Delco-Light batteries has either one or two cells
equipped with a pilot ball. Such a cell is known as a PILOT CELL. Fig.
294.

Pilot Cells are used to indicate to the USER the approximate state of
charge or discharge of the battery.

The pilot ball is a battery gauge which is UP or DOWN, depending upon
the state of charge of the battery.

Very high temperature affects the operation of the pilot ball. This
accounts for-the fact that occasionally a battery will be charged and
the pilot ball will be at the bottom of the pocket. A few hours later,
after the electrolyte has cooled, the pilot ball will rise to the top.

We urge that the user be made to feel that the pilot ball is an
excellent gauge