Fig. 89 shows a diagram of the Bijur lighting and starting system on the Jeffrey “Chesterfield-six.” The generator supplies current for the lights and charges a storage battery when the gas motor is running at speeds equivalent to ten or more miles per hour on high gear.

When the gas motor is running at speeds corresponding to less than ten miles per hour, all currents for lamps are drawn from the storage battery.

The starting motor is in operation only during the period of starting, and remains idle at all other times. The appliances shown in the diagram constituting the equipment are a six volt constant voltage generator, a six volt starting motor, starting switch, six volt hundred ampere hour battery, lamp controller, and a high tension magneto. Due to the reversible characteristics of the generator, no attention need be paid to the polarity of the wiring when it is removed and again replaced.

The starting motor pinion meshes with teeth on the flywheel when the starting switch mounted on the housing covering the motor pinion is compressed.

Operation of System Shown in Diagram.—After the gas motor reaches a speed equivalent to a car speed of approximately ten miles per hour on the third speed gear, the generator will generate and maintain a constant voltage, or electrical pressure at higher speeds and will also maintain this pressure constant at all loads.

The current output from the generator at any time will depend upon the condition of the storage battery. If a car has been left standing for some time with the lights burning, the storage battery will become more or less discharged and its voltage lowered. Under these conditions the generator voltage or pressure will be higher than that of the battery, forcing a comparatively high charging current into the battery. This current may be from 5 to 20 amperes, and the battery will rapidly approach the fully charged condition.

As a battery becomes charged its voltage increases reducing the difference in pressure between the generator and battery and decreasing the charging current to the battery.

ELECTRIC STARTING AND LIGHTING OPERATION

Current from the generator passes through an ammeter and this meter shows the current being supplied to the battery and the lights, or to the battery only when no lights are in operation.

Starting Motor.—The starting motor is provided with a square shaft and carries a pinion which can be moved horizontally on this shaft. This pinion meshes directly with teeth cut on the flywheel.

The starting pedal located at the driver’s seat connects through linkage to fork which shifts the link on the square shaft of the motor. The same foot pedal linkage operates the starting switch. Normally a spring holds the motor pinion out of mesh with the flywheel teeth, and also holds the starting switch in an “off” position.

Operation of the Starter.—Depressing the starter, one pedal operates the starting switch and makes a preliminary contact which connects the starting motor to the storage battery through a resistance located inside of the starting switch. This resistance permits a small amount of current to pass through the starting motor, causing its armatures to rotate at relatively slow speed. This slow rotation insures proper meshing of the pinion and flywheel teeth when they are brought into engagement. Depressing the foot pedal also shifts the pinion on the square shaft of the motor so as to bring it into contact with the teeth on the flywheel.

When the pinion is in full mesh with the teeth on the fly, the moving contact in the starting switch has traveled to a position where the resistance is cut out of the circuit, connecting the storage battery directly to the starting motor. The starting motor will then spin the gas motor.

Starting.—First see that the necessary adjustments have been made, then depress the starting foot pedal as far as it will go and hold it firmly in place until the gas motor starts. The instant the gas motor begins firing the foot pedal should be released. The starting pedal should be pressed as far as it will go without any pausing on the downward stroke.

Fig. 90 shows diagram of operation and wiring of the Bijur electrical system used on Jeffery 4-cylinder car.

If the pinion and flywheel teeth do not mesh properly do not hold the starting pedal down, release it and after a few seconds pause, depress the pedal again.

If the gas motor does not start firing promptly after spinning it with the electric motor, do not continue to spin it, but see that the proper adjustments for starting have been made and that there is gasoline in the carburetor, and that the ignition is in working order.

Continued spinning of the gas motor by the electric motor will not damage the electrical equipment but constitutes a useless drain on the storage battery and should be avoided.

Wiring.—Fig. 90 shows the circuits for all electric appliances on the Jeffrey-4 car. The various units are wired on the two-wire system. The “out of focus” filaments in the head lamp bulbs are wired on the three-wire system, the chassis acting as a neutral wire, one side of the “out of focus” filament being grounded in the head lamps. The “in focus” filaments are on the two-wire system.

The dash lamp is on the tail lamp circuit and is so arranged that these two lamps are always in operation when any combination of head lamp filaments are in use.

Fuse Circuits.—Each head lamp is separately fused, the current for both filaments in each head lamp bulb passing through one fuse.

Separate fuses are provided for the electric horn circuit and for the rear lamp circuit. The push button for operating the electric horn is mounted on the center of the steering post.

Ground Fuse.—A fuse is located in the ground circuit between the lamp controller and the magneto top to ground.

Lamp Controller.—A pair of wires from the terminals of the storage battery connect to the five position lamp controller. All lighting circuits connected to this controller which may be locked in any of the five positions.

Oiling should be practiced regularly every two weeks or every five hundred miles. Two or three drops of thin neutral oil should be put in each of the two oilers of the motor and in each of the two oilers of the generator. Do not flood the bearings with oil.

At the same time the starting motor shaft should be oiled. An oil hole is provided in the top of the starting motor gear case and about ten drops of cylinder oil should be used.

Fig. 91 shows a hydrometer syringe used for determining the specific gravity or density of the solutions in the battery cells.

To take specific gravity readings unscrew the filler or vent plug and insert the tube into the cell and release bulb slowly to draw the acid solution into the chamber until the hydrometer floats. The enlarged graduated stem shows a reading of 1.280 at the point where it emerges from the solution. After testing, the solution must be returned to the cell from which it was taken. Specific readings above 1200 show the battery more than half charged.

Gravity below 1.150 indicates battery completely discharged or run down.

Should the gravity fall below 1.150 the gas motor should be given a long run to restore the battery.