from The Century Dictionary and Cyclopedia
- n. The lever or handle by which the period at which a spark passes between terminals in an internal-combustion motor is controlled: used especially in motor-cars and motor-cycles, where such control of the instant of ignition is very important, as the resistance to be overcome or the desired speed may vary. Spark-levers are usually on the steering-post of motor-cars, and on the handle-bars of motor-cycles.
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