Page:Popular Science Monthly Volume 91.djvu/202

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The Automobilist's Mechanical Cost Keeper

It tells the mileage of the car, the life of each tire, and the gasoline and oil consumption


��THE latest device for the convenience of the automobile owner who desires to keep a complete record of his car operation is an instrument on which can be read at will the car speed, the trip mile- age, the total mile- age, the mileage of each of the four tires in use, the two spare tires usually carried, the gasoline and oil consumption and warnings at 500 and 1,000 miles of run- ning to indicate that adjustments, greas- ings, etc., are neces- sary. These thirteen records can be read as desired.

The device is no larger than the ordi- nary speedometer and is mounted on the dashboard in the

���the fuel tank or oil into the engine crank- case.

As shown in the accompanying illustra- tions, the thirteen odometers, nested within a casing on the oppo- site ends of parallel shafts, are covered by a ring-dial, around the circum- ference of which are divisions for each of the thirteen records. In the dial face is a slot in back of which the various odom- eters are moved ac- cording to the record desired. Those odometers to the right of the nest, as shown, are slid over to the left on their shafts by means of turning screws on the face of the in- strument so that the

���The device con- sists of thirteen separate odome- ters, operated in sequence by a series of spring- pawls in a casing surrounded by a ring dial having thirteen parti- tions for records

��'Dial" :

��This OdomeTer slid to --.jefT To register "th slots in face

���KLw the mileage of tire No. 4 is recorded on the instrument

conventional manner. It is driven by means of one flexible cable to the front wheel or to the engine propeller shaft, as desired, and consists of thirteen separate odometers, operated in sequence by a series of spring-pawls. All of the readings are obtained from the mechanical operation of the odometers and of the driving means, with the exception of the gasoline and oil records, which are manually operated and must be set each time gasoline is put into

��Turning screws slide the odometers from right to left on their shafts

figures register properly behind the slots in the dial, the latter being turned in the same operation.

When a new vehicle is purchased and the device attached, all odometers are set at zero. The speed in miles per hour, the trip and total mileage are registered in the usual manner ; one odometer serves to give the same reading on each of the four tires fitted. If tire No. 1 was removed at 1,000 miles, the face of the dial would be


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