16 BULLETIN 198, UNITED STATES NATIONAL MUSEUM 



which is integral with the splined shaft, is 3-dimensional, which 

 means that as it is moved back and forth with respect to its follower it 

 will advance or retard the motion of the follower and consequently the 

 valve timing. The speed of the engine was controlled in this way. 



Mounted on the back of the chassis, next to the intake end of the 

 piston valve, is the carburetor, which is of the constant-level type, 

 with hinged float and needle valve. This is similar to, and has all the 

 essential features of, the modern type of carburetor, the needle valve 

 being located horizontally near the top of the bowl. A jet, which is 

 adjusted by a metering pin, projects into the intake manifold, which 

 then leads directly to the intake end of the piston valve. The portion 

 of the manifold on the other side of the jet is perforated with many 

 small holes. Air, sucked through these holes as the piston descended, 

 was carried past the jet to form the explosive mixture, which passed 

 by the piston valve and then by the poppet valve. Mounted on the 

 carburetor cover plate is a vent tube leading to the float chamber. 

 When starting the engine the operator placed a rubber hose on this 

 tube. Blowing into the hose caused a gasoline mixture to be forced 

 out of the jet and into the intake manifold. There is no butterfly 

 control of the carburetor, all speed control of the engine being exer- 

 cised by the sliding camshaft. The exhaust end of the piston valve 

 is connected by a long tube to the muflOier, which is transversely 

 mounted next to the chassis cross member in front of the engine. 



A cylindrical sight-glass oil tank is bolted to the front of the crank- 

 case, allowing oil to flow via two oil lines to each of two main bearings, 

 and thence to drip into the crankcase. Bleeder holes in the oil ring 

 groove of the piston prevented "oil pumping" and returned oil to the 

 crankcase. 



The flywheel is on the left end of the crankshaft. The transmission 

 is planetary and provides two speeds forward and neutral. There is no 

 reverse. Control is by means of a vertical shaft mounted to the left 

 of the driver's seat. The same shaft also supports the shaft that 

 controls the engine speed. A chain connects the transmission sprocket 

 to the sprocket on the rear axle. 



The wooden body seats two and is upholstered in black leather. 

 Beneath the cushions are the gas tank and a battery and coil com- 

 partment. 



The back of the body is a utility compartment with a wooden cover. 

 The body has two leather rebound straps passing beneath the back 

 of the cliassis. An ignition switch is located on the front of the coil 

 compartment, behind the black leather seat curtain. 



In the floorboard, near its left edge, is a ratchet-held brake pedal, 

 which operates an external band on a drum of the transmission. A 

 warning bell is mounted to the right of the brake pedal. 



