Mechanics / Electrodynamics
dipoles, radiation, emission theory, lines of force
Bulletin of the American Mathematical Society
The Production of Light.-According to an idea that is generally associated with the names of Faraday and J. J. Thomson, energy is radiated from an electric charge in the form of light or electric waves when the lines of electric force issuing from the charge assume a wavy form. This idea has been made more definite by a study of the form of the lines of force in various types of electromagnetic fields. It is known now that waves on the lines of force may be produced either by an oscillation of the electric charge or by the continual emission of either electric or magnetic doublets. The emission of a single electric charge produces a kink in each line of force while the emission of a single magnetic charge produces a rotation of each line of force.