Outstanding scientist, born in north London on 6 July 1906 and educated at Southgate County School. He became Professor of Applied Optics at the Imperial College of Science and Technology, London, where he spent most of his career, though his reputation was international. His pioneer work on the measurement of colour contributed to the development of colour TV and he also did research into eyesight colour definition. He received an honorary DSc. from City University in 1971. He published five significant books on his special field and contributed to many other publications. He was one of those for whom science and religion were not opposed but complementary, and he was for many years a member at The Bourne, Southgate, where he was Superintendent of the large Sunday School. He died on 4 June 1997.