Richard Tetley Glazebrook (18.09.1854—15.12.1935) was an English experimental physicist and a Fellow of the Royal Society (1882). He was born in Liverpool. He graduated from the University of Cambridge (1879). In 1876-95 he worked at the Cavendish Laboratory and was a lecturer at the University of Cambridge (1881—97), and in 1900 — 19 he was director of the National Physical Laboratory.
His research concerned optics, thermometry, electrical measurements, the determination of the fundamental physical constants and aeronautics. He invented a polarising prism made of a crystal of Iceland spar, used as a polariser or an analyser in polarisation instruments (the Glazebrook prism). In 1883 he developed a theory of the concave diffraction grating. He was the author of many physics textbooks. He was president of a number of scientific societies.