Before physics settled into universities, showmen toured Europe and America performing electricity and magnetism as public spectacle — charging Leyden jars, 'electrifying' volunteers pulled from the audience — part entertainment, part popular science education. As the discipline professionalized into laboratories and lecture courses, the traveling demonstrator largely disappeared.
Itinerant electrical demonstrator no longer exists as a living trade. Here is what erased it, and which profession took on the work.
1543–1687
The Scientific Revolution
Copernicus's 1543 heliocentric model, Galileo's telescopic observations and his 1633 trial by the Inquisition, and Kepler's laws of planetary motion together broke the authority of ancient and church-sanctioned physics. Newton's 1687 Principia then supplied the mathematical synthesis — laws of motion and universal gravitation — that the rest of the era's evidence had been pointing toward.
What else was happening then
1831
Faraday discovers electromagnetic induction
Michael Faraday shows that a changing magnetic field induces an electric current, the principle behind every electric generator, transformer and motor built since.
1865
Maxwell unifies electricity, magnetism and light
James Clerk Maxwell publishes equations showing that electricity and magnetism are two faces of one field, and that light itself is an electromagnetic wave travelling at a predictable speed.
Where that work lives now
Derives and tests the mathematical laws governing matter, energy, space and time, from a lone chalkboard to a 3,000-author particle-collider paper.
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