Henry Moseley (23.09.1887-10.08.1915) was an English physicist and one of the founders of X-ray spectroscopy. He was born in Weymouth. He graduated from the University of Oxford (1910). In 1910—14 he worked at the University of Manchester under E. Rutherford, and then at Oxford.
His research was in beta, gamma and X-ray spectroscopy. Studying the X-ray spectra of the chemical elements, he discovered in 1913 — 14 the law relating the frequency of the spectral lines of the characteristic X-ray radiation to the atomic number of the emitting element (Moseley's law). This law was of great importance for establishing the periodic law of the chemical elements and for giving the atomic number of an element its physical meaning. He measured the wavelengths of X-rays and predicted the X-ray spectra of some elements. His research also touched on radioactivity.