Before revision: 1873 – Willoughby Smith discovers the photoelectric effect in metals not in solution (i.e., selenium).
After revision: — The British Association establishes the units volt, ampere, and ohm.Fleeming Jenkins (1873) Report of the Committee on Electrical Standards via HathiTrust 18731873 – Willoughby Smith discovers the photoelectric effect in metals not in solution (i.e., selenium).