The discovery of the electron was a complex and extended process, stretching from Faraday's investigation of electrolysis to Millikan's oil-drop experiments [18]. The results of four different fields (electrochemistry, electromagnetic theory, ► spectroscopy, and ► cathode rays) converged to support the existence of a novel subatomic constituent of matter. Faraday's experiments on electrolysis, interpreted from the perspective of the atomic theory of matter, implied that electricity has an atomic structure [4]. That is, electricity appears in naturally occurring units. In 1891 George Johnstone Stoney (1826–1911) named those units “electrons” ([13], p. 583, [30]).