1865 (electromagnetic-field paper published) / Europe

Maxwell connects electricity, magnetism and light through fields

A mathematical field theory linked electrical and magnetic processes and described light as an electromagnetic disturbance.

Purple electric-field and gold magnetic-field waves with a relation for the speed of light
Modern scientific illustrationModern teaching diagram of perpendicular electric and magnetic fields in an ideal plane wave in vacuum, both transverse to propagation. It uses modern SI notation; the projection is not to scale or a figure from Maxwell’s 1865 paper.CivAtlas · CivAtlas (original scientific diagram) · CC0 1.0 Universal Image credit & source

The story

Submitted and read in 1864, A Dynamical Theory of the Electromagnetic Field was published in 1865. Building on Faraday and others, Maxwell examined how electromagnetic disturbances propagate and related their speed to that of light. His scalar equations and notation were not the four-equation vector notation common today; Heaviside, Hertz and others later helped recast the theory, while experimental tests continued.

Connections and context

Faraday’s experiments, mathematical development and Hertz’s wave investigations connected across generations, preparing foundations for radio and new questions about spacetime.

Dates and precision

1865 (electromagnetic-field paper published) Documented date

Positioned by the documented year, month or day. Missing precision is not inferred.

Representative map location

London

London identifies the Royal Society setting of presentation and publication, not the full network of experiments and correspondence.

Representative coordinates · 51.5074°, -0.1278°

A marker identifies one representative place, such as a manuscript collection, laboratory or observing site. It does not mean the work happened only there, or assign a shared discovery to one country.

Bibliography

  • Royal Society archive: A dynamical theory of the electromagnetic field
  • James Clerk Maxwell: A dynamical theory of the electromagnetic field (1865)
  • Royal Society historical analysis of Maxwell’s 1865 paper

References are listed as plain bibliography titles. They support particular facts or context; a reference does not certify every interpretation in a story.

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