Excerpt from Gasoline Engine Ignition
The average person naturally understands nothing regarding electricity, and the only accessory about a gasoline engine in which he has no confidence is this particular part.
A wire, when charged with an electrical current, contains a property adverse to the natural state of the wire when not electrified. When a wire has an electrical current flowing through it, magnetic lines of force surround it to a distance consistent to the strength of the current. If the wire is wound in a circular form, in layers, forming a coil, the magnetic lines of force are increased in strength, and if wound around a bar of soft iron an additional increase is gained.
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