Ludvig Lorenz and His Non-Maxwellian Electrical Theory of Light

Maxwell’s celebrated electromagnetic theory of light dates from 1865. Two years later, without appealing to the ether as a carrier of light waves, the Danish physicist Ludvig Lorenz (1829–1891) independently published another electrical theory of light based on optical equations and the novel idea of retarded potentials. In spite of resting on a very different conceptual foundation, Lorenz’s theory led to almost the same results as Maxwell’s. But whereas Maxwell’s field theory heralded a revolution in physics, Lorenz’s alternative was largely forgotten and soon relegated to a footnote in the history of physics. In part based on archival material and other sources in Danish, this paper offers a detailed contextual account of Lorentz’s theory and its reception in the physics community. Moreover, it includes a brief introduction to other of Lorenz’s scientific contributions and discusses the reasons why his electrical theory of light failed to attract serious interest.