hand valve, were used to vary the pressure on the valve pis- 

 tons and so control the speed of the engine. As the air pres- 

 sure was reduced, the valve opening and the engine speed 

 were increased. The aluminum, float-equipped carburetor 

 contains no throttle valve. 



An oil reservoir of sheet brass, secured to the right side 

 of the engine, delivered oil by gravity to a 16-unit, sight- 

 drip oiler (fig. 72) located at the front of the engine above 

 the air pump. A shut-off valve is placed between the res- 

 ervoir and the oiler. Each unit of the oiler is equipped with 

 a sight glass and a metering adjustment. The oil dripped 

 by gravity to the camshaft and engine bearings, to the tim- 

 ing gears, to the cylinder walls, and to the bearing surfaces 

 of the air pump. 



To the left of the air pump is a large, hard-rubber, low- 

 tension ignition timer (fig. 73), driven from within the tim- 

 ing-gear cover. The timer can be advanced and retarded 

 by means of a lever placed near the steering column and 

 within reach of the driver. It is not known now where the 

 coils and battery were located. A threaded spark-plug hole 

 is provided in the top of each cylinder, above the center of 

 each piston. 



Also driven from within the timing gear cover is the cen- 

 trifugal water pump attached to the left side of the crank- 

 case. The discharge opening of the pump leads into the 

 left section of the water jacket of the engine. The cooling 

 water passed from the top of the right section of the water 

 jacket to a water tank secured to the right side of the engine 

 behind the oil reservoir, then to the upper right portion of 

 the radiator, and from the lower left of the radiator back to 

 the pump. The water tank has an overflow pipe and a filler 

 opening for the entire water system. 



The radiator, placed low at the extreme front of the car, 

 consists of 54 horizontal tubes arranged across the front, six 

 rows deep and nine rows high, each tube carrying dozens 

 of cooling disks pressed into place. The adjacent ends of 

 the tubes are connected by cast aluminum header plates on 

 each side of the radiator. As each plate incorporates diver- 

 sion channels, the flow of water from side to side was con- 

 trolled. The water tank is formed of sheet copper with 

 soldered seams. 



92 



