group at the Cavendish Laboratory of Cambridge University with J. A. Ratcliffe on magneto-ionic theory of radio wave propagation in the atmosphere. At Malvern, Booker was in charge of theoretical research, covering antennas, electromagnetic wave propagation, and radar systems. After World War II, he taught mathematics at the University of Cambridge, until joining Cornell University in 1948. In 1965 he moved to the University of California at San Diego. The International Union of Radio Science named a Fellowship in his honour. His publications include four books. B. V. Bowden, worked on radar. Later, he became Baron Bowden, of Chesterfield in the County of Derbyshire, Minister for Education and Science in 1964 and Vice-Chancellor of the University of Manchester Institute of Science and Technology, E. G. ("Taffy") Bowen (later FRS, CBE) Member of team at Orfordness who, by 1935, had developed the radar that first detected an aircraft. This led to the Chain Home ground-based radar. At Bawdsey, he began development of airborne radar. In 1940 he went to the U.S. with the Tizard Mission. In 1943 he joined the CSIRO in Australia. R. P. Chasmar, co-author of definitive text The Detection and Measurement of Infra-red Radiation, Clarendon Press, 1960 and, for many years, Head of the infra-red group at RRE. Robert Cockburn, electronics engineer. He directed the development of radar jamming systems (counter measures) code named Window and widely known as Chaff. An obituary describes this work as "a main contributor to the reduction of civilian [air raid]casualties ... and [bomber] losses". He is in a group photograph. Later, he was knighted. Joan Curran, invented the Window (Chaff) radio countermeasure system. As Samuel Curran's wife, she became Lady Joan Curran. She also went to the Manhattan project when he did. Samuel Curran, worked on radar at TRE, joined the Manhattan project in 1944, where he invented the scintillation counter, then the United Kingdom Atomic energy authority where he invented the proportional counter, then became Vice Chancellor of the Royal College of Science and Technology and led it to become the University of Strathclyde. He was knighted. Philip Dee designed the Automatic Gun-Laying Turret, known by the code name Village Inn, Robert J. Dippy, electronic engineer, who was a pioneer of radio navigation. He developed and devised GEE and Loran-A of major importance in D-day invasion. He received the Pioneer Award of the IEEE in 1966 for hyperbolic radio navigation. G.