50 BULLETIN 198, UNITED STATES NATIONAL MUSEUM 



The rear-axle assembly is a complete unit of the floating type. The 

 housing is composed of three sections, the center one holding the 

 complete differential mechanism, including the worm and worm wheel. 

 The two end sections containing the axle shafts are bolted to it. The 

 axle shafts are fitted into the differential unit by means of splined 

 ends. Torsional strains are taken care of by means of a torque bar 

 connected to the lower front of the differential housing by a tapered 

 joint and to the motor by a universal connection. The bar lies directly 

 beneath the propeller shaft. 



The rear-axle assembly is attached to the frame by two seven- 

 eighths-elliptic springs. The upper part of each spring is pivotally 

 connected to the frame, and the lower part is similarly supported on 

 the axle housing. The forward end of the lower half of each spring 

 is connected to a spring bracket at the side of the frame. The spring 

 eyes are fitted with bronze bushings, while hardened and ground spring 

 bolts with grease cups are used. 



The brakes on the rear wheels are of the internal expanding type 

 and are operated by either of two pedals, as the vehicle is fitted with 

 dual controls permitting operation from either the front or the rear 

 seat. Each brake pedal incorporates a ratchet to lock it in the de- 

 pressed position. 



The front axle is tubular and is attached to the frame by two conven- 

 tional semielliptic springs. The front wheels turn on individual steer- 

 ing knuckles connected by a tie rod. The drag link, connected to the 

 left steering knuckle, is operated by either of two steering bars, one 

 at the front seat and one at the rear seat. 



The wheel base of the chassis is approximately 100 inches and the 

 tread 54 inches. Wooden-spoked wheels are provided with 36-by-4- 

 inch solid rubber tires. The vehicle's weight is approximately 4,000 

 pounds. 



A controller handle is located to the left of both the front and 

 rear seats. These complete the dual set of controls and allow the 

 driver to control the vehicle from either seat. 



Each controller handle has a built-in cylinder lock. Moving the 

 handle to the rear applies an external contracting brake on the motor 

 shaft, while moving it forward controls the speed of the motor. To 

 reverse the motor, the operator depressed a pedal in front of the 

 driver's seat, at the same time operating the controller handle as be- 

 fore for the speed control. 



Beneath the rear-seat cushion is a compartment, which now contains 

 a set of tire chains and a Weston combination voltmeter and ammeter. 

 The voltmeter scale range is from zero to 120 volts, and the ammeter 

 scale from plus 50 to minus 150 amperes. The instrument could 

 indicate the state of charge and the rate of charge and discharge of the 



