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High-tension Circuit

- With all internal-combustion engines, except such as use low-tension magneto, the current which gives the spark at the plug is confined to the high-tension circuit. This, inclusively, refers to the high-tension coils on the magneto (or induction coil), the insulated cable therefrom, and the "earth" return path, which completes the circuit. For a current to flow there must always be provided a continuous path along which it can travel uninterruptedly.'