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The 17th and 18th centuries understood electricity as material forces and flows that come in and out of a body through the pores on its surface, what they called "effluvia" and "affluvia." These two forces are their solution to the concepts of electric attraction and repulsion, which would later be corrected as positive and negative electric charges.
In Nollet’s image, the emanating lines at the center represent the attractive forces from an electric body, and emanating point on the upper left represents how an initial attraction would result in the acquiring of an identical electrical property and the eventual repulsion between the two bodies.
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