Arizona republican., 1921-01-09
ELECTRIC SYSTEM
 FULLY EXPLAINED
By A. S. Earnhart, Auto Eleetriea En- ainser Battery Service Company

Electricity has done more towards the modern izinG of the automobile than any other agency. | fear that We do not appreciate the engineering skill that has been put forth during the past 10 years Co perfect the application of electricity 10 the automobile.
 Only a few years ago, the electri, starter was considered impractical. but today the pressing of button starts the car and what used to be the great Drawback of the ownership of a car The task of cranking--is not now given a thought
 The electric system of your car is a complete electric plant combining practically an the uses known 10 Che electrical engineering profession. In this system. we have three distiuc' features and we will point out their respective or relative positions.
 First we have a storage battery or a combination of cells and acid SO con- structed that they will give or take electricity in a chemical action. This storage gives us starting supply. ln a neat housing attached to the fly wheel housing is your electric motor connected direct to your battery through @ switch on the floor board.
 When you close thls switch. you complete a circuit for the positive end of your battery to the negative. thus creating a chemical action that sets up a flow of electricity through your mo- tor. causing it to revolve and turn the gas engine. As soon as the gas motor starts you break the switch which stops tho action set mp in the battery, but fin this period of starting you have taken away a portion of the giving supply of your battery and returned it dormant Co the receiving end of your battery
 IL here iremains until something is done to set up a reverse chemical ac- ton By way of explanation we will state that every atom of electricity produced and sent out on a line re- turns in full to it's source a dormant power. When you set your starter then in motion the power flows out Of the lite end of the battery. is consumed iu turning the starter and gas motor and the full volume flows back to the negative end of the battery, stripped oI it's power.
 The third unit of this plant is tn, generator which produces flow O. current of the right voltage through magnetic cut-out into the positive ent of your battery thus reversing tn, chemical action in the battery causing the chemicals to take their formei place which they held before the start CT action took place. Now this curren produced by the generator expends iti force against this chemical reverse a. said current returns dormant througl the negative terminal
 The most complete element of thi system is the cut-out relay whicl stands guard over the line between tn battery and the generator When tn generator builds up to seven and three tenths volts tho cut-out closes, com pleting the circuilt. The battery volt age is six. Thus you can see why thi switch must not close until the gene rator is producing more pressure thal the battery. otherwise the curren would flow the wrong way. When tn generator falls below the above voltage the switch opens acting as a safet. valve for tho battery.
 This system is as near fool proof a it is possible Co make it. However there are a few point which must bt looked after by the motorist. as fol lows.
 Keep distilled water in your battery Don't adjust and regulate unless yo know what you arc doing. Keep cleo trical parts as free from grease and dir