52 BULLETIN 108, UNITED STATES NATIONAL MUSEUM 



tapered, roller bearings. The complete gear train is mounted on a 

 cover plate bolted to the axle housing. This cover plate and gear 

 train can be removed as a unit from the axle housing for inspection 

 and adjustment purposes. The rear wheels are mounted on adjust- 

 able, tapered, roller bearings carried on an extension of the axle hous- 

 ing. By this means the rotating parts of the rear axle carried no part 

 of the weight of the car, their only function being to transmit the 

 power to the rear wheels. The driving axles are of heat-treated alloy 

 steel. The rear tires, of solid rubber, are 36 by 10 inches. 



The engine and clutch are in one unit, which is carried in the frame 

 by means of 3-point suspension under the seat structure. The engine 

 is a 4-cylinder, 4-cycle, water-cooled unit of 4i/4-inch bore and Si^- 

 inch stroke, with a rated horsepower of 28.9. It is equipped with a 

 counterbalanced crankshaft of heat-treated alloy steel mounted on two 

 ball bearings. 



Carburetion was effected by means of an automatic, float-feed type 

 of carburetor. Gasoline was delivered to the carburetor by gravity 

 from a 25-gallon tank behind the seat. 



The water for the cooling system was circulated by a centrifugal 

 pump and cooled by means of a vertical-tube radiator. Air circula- 

 tion was assisted by a belt-driven fan behind the radiator. 



Ignition was by a high-tension magneto, gear driven by the engine. 



Engine lubricating oil was circulated by a gear pump driven from 

 the camshaft and located in the lower engine pan. The pump supplied 

 oil to jets under the connecting rods, insuring a constant level for the 

 connecting rod dippers under all conditions. 



The clutch is of the dry-disk type, consisting of two driving plates 

 faced with asbestos fabric and attached to the flywheel, and one driven 

 plate attached to the driving shaft. It is controlled by a pedal. 



The transmission is of the selective type, with four forward speeds 

 and one reverse. All gears and shafts are heat-treated alloy steel 

 mounted on ball bearings. The transmission is suspended from the 

 frame at three points and is connected to the clutch by a fabric-disk 

 universal joint. Power was transmitted to the rear axle by means of 

 a tubular drive shaft equipped with a universal joint at each end. 



Steering is effected by means of an irreversible steering gear on the 

 left side of the vehicle. 



The two sets of brakes, service and emergency, operate on steel 

 drums bolted to the rear wheels. Both are of the internal expanding 

 type, the service brake being operated by a pedal, and the emergency 

 (or parking) brake by a hand lever. 



Speed changes are made by a hand lever to the right of the driver. 

 Engine speed was controlled by spark and tlu-ottle levers on the steer- 



