CATALOG OF THE AUTOMOBILE COLLECTION 39 



The engine, of 4%-inch bore and 6-inch stroke, ran at a maximum 

 speed of a little over 700 revolutions per minute. It is placed hori- 

 zontally, with the cylinder head at the rear of the car and the flywheel 

 below the seat. The inlet and exhaust valves are located in a chamber 

 at the side of the cylinder head and are operated mechanically by 

 rockers working from cams on a shaft turning at half crankshaft 

 speed. This shaft, parallel to and outside the cylinder, is driven by 

 gearing at the crankshaft. The exhaust valve cam has an additional 

 projection that lifted its valve a small amount for obtaining less com- 

 pression for aiding in starting the engine. This projection is cam- 

 shaped and is diagonally opposite to the position of the main exhaust 

 cam. In addition, it is in a different plane from that of the cam 

 proper, and so it is normally not in operation but is brought into use by 

 the depression of a foot button. This action shifts the exhaust rocker 

 so that its roller will bear against both the cam proper and the auxil- 

 iary, smaller cam, thus not allowing the exhaust valve to seat com- 

 pletely during a complete revolution of the engine. By the removal 

 of a cover, both valves are accessible for inspection. 



The ignition was of the high-tension type, fed by a set of 6-volt dry 

 cells. The current passed through a trembler coil, and the time of 

 firing was controlled by a commutator placed on the half -speed cam- 

 shaft. A spark plug is screwed into the end of the cylinder, and the 

 charge was ignited when the piston was at approximately top dead 

 center. A small lever at the driver's right allowed the spark timing 

 to be advanced or retarded. 



The carburetor was made by George M. Holley, of Bradford, Pa., 

 and is of the constant-level, float type. The speed of the engine was 

 controlled by a throttle valve in the carburetor, connected by linkage 

 to a pedal in front of the driver. The gasoline tank is at the right 

 rear of the car, beneath the deck behind the seat and above the 

 carburetor. 



The exhaust gases were passed through a muffler to the left of, and 

 below, the engine. 



Cooling fins and a water jacket surround the cylinder of the engine, 

 the fins being at the end nearer the crankcase. A water tank is at the 

 left rear of the car, beneath the deck. The radiator is composed of a 

 long tube, over which are slipped hundreds of radiating disks, bent 

 and shaped so that it forms a compact unit. It is suspended hori- 

 zontally beneath the floorboard. Water was circulated by a gear pump 

 driven by the left end of the crankshaft. All water connections are 

 made with rubber hose. 



Grease cups are fitted to the two main bearings. A sight- feed oil 

 cup provided lubrication to the cylinder wall, the flow being adjustable 

 by a lever mounted on the wooden panel behind the driver's legs. A 



