Opposite the exhaust valve cam on this shaft, and in a 

 different plane, is an auxiliary cam. The depression of a 

 foot button shifts the exhaust rocker so that its roller bears 

 against both the cam proper and this auxiliary cam, and 

 prevents the exhaust valve from seating completely. By 

 this means, compression can be reduced while the engine 

 is being cranked. The removal of a cover makes both 

 valves 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 camshaft. 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 made by George M. Holley, of Bradford, 

 Pa., 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 horizontally 

 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 drain cock in 

 the bottom of the crankcase allowed the old oil to be re- 

 moved after it had accumulated. 



The starting crank handle is placed on the right side of 

 the body, enabling the engine to be cranked by the driver 



112 



