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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.

With batteries and a spark coil, we can easily send that distance, certainly in this mountain atmosphere.

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