Edward Neville da Costa Andrade (27.12.1887 — 6.06.1971) was an English physicist and a Fellow of the Royal Society (1935). He was born in London. He graduated from the University of London (1907). In 1920—28 he was professor at the Artillery College in Woolwich, in 1928—50 at the University of London, and in 1950—52 director of the Royal Institution and of the Davy—Faraday Laboratory. His research was in the field of the physics of liquids, metal physics, spectroscopy, atomic physics, acoustics and the history of physics. He derived a formula for the way the viscosity of a liquid depends on temperature, and a formula showing that the viscosity of a liquid at its melting point is a function of atomic weight, density and temperature. Studying the creep of metals, he established the law of creep. He developed a method of obtaining single crystals of metals. He proved that the state of the surface of a metal affects its properties. Together with E. Rutherford he proved in 1914 that the X-ray spectra of isotopes are identical, thereby finally confirming that the isotopes of a given element have the same atomic number. In the same year E. Andrade and E. Rutherford carried out the diffraction of gamma rays and so proved their electromagnetic nature. The D. Hughes Medal.