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Technical Diagram, Gray & Davis Two-Wire System

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STARTING, LIGHTING AND

IGNITION SYSTEMS

CHAPTER I

ELEMENTARY ELECTRICITY

Nature of Electricity-Why Current Flows-Parts of Circuit-Conductors and Insulators-Methods of Producing Electricity-How Primary Battery Generates Current-Wiring Dry Cells-How Storage Battery WorksMagnetism-Current Production by Induction-Magneto Action-Low Tension Magneto-High Tension Systems-Dynamo and Motor ActionMethods of Winding-Electrical Terms Defined-Electrical Measuring Instruments.

MANY forces exist in the universe the character of which have never been solved and may never be to the end of the world. We know these forces exist because their presence is made known by well understood phenomena. Among these forces gravitation, light, electricity and magnetism are prominent and even in this advanced age no one has a very clear conception of the nature of any of these forces nor would a presentation of theory and surmise be of any material benefit to those who are more concerned with the practical utility and the way these forces can be made of value to man than with a scientific presentation of theoretical causes.

Nature of Electricity.-A knowledge of electricity is of great value in permitting the reader to grasp clearly the principles underlying the operation of the various units comprising the ignition, starting and lighting systems of the modern motor car. If the following explanations are carefully studied it will be possible for one without any previous electrical training to understand intelligently the functions of electrical appliances and make it easier to locate and remedy troubles that are apt to materialize in these appliances. Electricity is a form of energy and is known because

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