spark coil

This winding constitutes all of the magneto windings, no external spark coil being necessary.

Wire from last carbon to spark coil and from coil to switch, and from switch to one of the connections on the engine.

I must brace up that tank and put in a new high-tension wire from the spark coil.

"You wouldn't have beaten me if my spark coil hadn't gone back on me," he said, somewhat sneeringly.

If a ground causes a continuous current, the spark coil will attract the armature, thus causing the bell to ring continuously.