changes are provided. A clutch located on the crankshaft 

 extension between the engine and the driving gear, and a 

 band brake on the drum of the clutch, are operated by a 

 single hand lever. 



No throttle is provided, but speed of the engine was varied 

 by means of a spark-advance lever. A fuel-flow reg- 

 ulator is provided on the exhaust-heated, gasoline vaporizer. 

 The main exhaust pipe leads into a small muffler. The 

 gasoline tank is located in the frame beneath the saddle, and 

 the high-tension coil and batteries are in a box farther 

 forward in the frame. 



Bicycle pedals, with the usual sprockets and chain, en- 

 abled the rider to start the engine, or in the event of an emer- 

 gency to pedal the vehicle. An overrunning clutch is built 

 into this gearing so that the pedals are not driven by the 

 engine while the tricycle is in motion. 



The three wire-spoked, bicycle-type wheels mount 26-by- 

 2 1 / / 2-inch single-tube pneumatic tires, of which, Clarke has 

 stated, the front one is one of the original three and has 

 never been off the wheel since its installation. The front 

 wheel is supported in a fork and is steered by handle bars. 



Figure 41. — Rear of 1897 Clarke tricycle, showing 1 -cylinder engine. 



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