A dynamical theory of the electromagnetic field
A scientific paper by James Clerk Maxwell, published by the Royal Society in London in 1865, setting out his mathematical theory of electromagnetism for other physicists to read. Its one picture is a plain line diagram of a circuit: a battery B between points A and C, with branches labelled P, Q, R, S, a galvanometer G, and wires marked x, y, z. A designer might take from it the clean, schematic style of labelled network drawings, with letters placed directly on lines and no shading.
