ture of Jars. Types of Cell
Covers. Single and Double Covers. Covers Using Sealing Compound Around
the Cell Posts. Covers Using Lead Bushings Around the Cell Posts. The
Prest-O-Lite Peened Post Seal. Batteries Using Sealing Nuts Around
Cell Posts. Construction of Vent Tubes. Exide and U. S. L. Vent Tube
Design. Vent Plugs, or Caps. Manufacture of the Battery Case.
Assembling and Sealing the Battery. Terminal Connections. Preparing
the Completed Battery for "Wet" Shipment. Preparing the Completed
Battery for "Dry" Shipment. "Home-Made" Batteries.

4. CHEMICAL CHANGES IN THE BATTERY

Chemical Changes in the Battery. Plante's Work on the Storage Battery.
Faure, or Pasted Plates. How Battery Produces Electricity. Chemical
Actions of Charge and Discharge. Relations Between Chemical Actions
and Electricity.

5. WHAT TAKES PLACE DURING DISCHARGE

What a "Discharge" Consists of. Voltage Changes During Discharge. Why
the Discharge Is Stopped When the Cell Voltage Has Dropped to 1.7 on
Continuous Discharge. Why a Battery May Safely be Discharged to a
Lower Voltage Than 1.7 Volts per Cell at High Rates of Discharge. Why
Battery Voltage, Measured on "Open Circuit" is of Little Value.
Changes in the Density of the Electrolyte. Why Specific Gravity
Readings of the Electrolyte Show the State of Charge of a Cell.
Conditions Which Make Specific Gravity Readings Unreliable. Why the
Specific Gravity of the Electrolyte Falls During Discharge. Why the
Discharge of a Battery Is Stopped When the Specific Gravity Has
Dropped to 1.150. Chemical Changes at the Negative Plates During
Discharge. Chemical Changes at the Positive Plates During Discharge.

6. WHAT TAKES PLACE DURING CHARGE

Voltage Changes During Charge. Voltage of a Fully Charged Cell.
Changes in the Density of the Electrolyte During Charge. Changes at
the Negative Plates During Charge. Changes at the Positive Plates
During Charge.

7. CAPACITY OF STORAGE BATTERIES

Definition of Capacity. Factors Upon Which the Capacity of a Battery
Depend. How the Area of the Plate Surfaces Affects the Capacity. How
the Quantity, Arrangement, and Porosity of the Active Materials Affect
the Capacity. How the Quantity and Strength of the Electrolyte Affect
the Capacity. Why Too Much Electrolyte Injures a Battery. Why the
Proportions of Acid and Water in the Electrolyte Must Be Correct if
Specific Gravity Readings Are to Be Reliable.

8. INTERNAL RESISTANCE

Effect of Internal Resistanc