Fluid theory of electricity
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The fluid theory of electricity is a now defunct theory that postulated an electrical fluid which was responsible for many electrical phenomenon. Although he was not the first proponent, Benjamin Franklin worked to develop the theory. The Leyden jar was seen as a confirming case for this theory since it appeared to be a jar capable of holding the electric fluid.
The development of the theory is briefly recounted in the 19th century book, A Guide to the Scientific Knowledge of Things Familiar by Ebenezer Cobham Brewer.