The following excerpts from Michael Faraday's Select Researches in Electricity (1839-1855) describe some of the experiments involved in his demonstrating the links between electricity and magnetism.

The progress of the electrical researches which I have the;honour to present to the Royal Society, brought me to a point at which it was essential for the further prosecution of my inquiries that no doubt should remain of the identity of distinction of electricities excited by different means. It is a fact, too, that many philosophers are still drawing distinctions between the electricities from different sources; or at least doubting whether their identity is proved. . . .

Notwithstanding therefore, the general impression of the identity of electricities, it is evident that the proofs have not been sufficiently clear and distinct to obtain the assent of all those who are competent to consider the subject...