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Nick Jr., the first in his family to receive a formal education, became fixated on electricity when he helped his godfather repair the spark coils on his Model T Ford.

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

She turned the fly wheel far enough to get the buzz of the spark coils.

“Best of all, though,” added Jack, “we have our field outfit of generator, tubes, spark coils, batteries and wire with us.”

In wireless telegraphy, a spark coil sets up waves in the ether and other coils similarly "tuned," receive the waves anywhere in the universe.