It is so particularly in the case of an automobile driver. The steering wheel is a sort of antennæ, which imparts a vibratory intelligence to him, that cannot be grasped or understood by others in the car. At first the matter of driving is a feeling of intensity in doing certain things, and in trying to anticipate the conditions. This state of mind continues until driving becomes a reflex action. The throttle, or the pedals are instinctively moved; the throwing in of a gear is proceeded with in an easy, natural fashion, and the starting movement is brought about without a perceptible jerk. [Illustration: Fig. 105. Ignition Wiring.] WIRING FOR LIGHTING.--For the purpose of giving a comprehensive idea of the method used in wiring up the lighting apparatus of a car, a full page diagram is given, Fig. 104, which is regarded as the most approved form. This shows two main head lamps, a rear lamp, two side lamps, and a dash lamp. The system is equally well adapted for battery or dynamo generation, and by the aid of the sketch all the circuits can be readily traced out on a machine, or an initial installation put in. WIRING UP FOR IGNITION.--As an important part in the care of a car depends on knowing the correct leads of all wires in the ignition system, a plain diagram is presented, Fig. 105, which, if carefully studied, will serve as a guide for this type of ignition. The engine shows two independent batteries as the source of electrical power for starting, and a motor-generator for running service. The motor generator transforms the direct current of the batteries into the alternating current necessary for ignition, which latter is raised to a high tension in the ordinary way, as heretofore explained. The sizes of the two sets of wires are also indicated, and the switch shows how connection is made when the starter switch is thrown in. CHAPTER XV FUEL AND LUBRICANTS There is greater misconception and real ignorance about gasoline than concerning any other subject or material connected with automobiles. The explosive nature of gasoline seems to act the same as gunpowder, whereas, in fact, it is entirely different. Knowledge on this important subject is lacking, because not enough care and study has been bestowed on it to bring out the proper information. Most people know that in order to explode gasoline in an engine, air is required; but few of them stop to consider that air is also the important thing necessary to burn gasoline in the open air.