posting saw him responsible for two coastal radar stations and testing the latest radar sets in night fighters. At the end of 1942, Bolton was transferred to the Telecommunications Research Establishment, the headquarters of Britain's wartime radar research and development. At this location he met many of what would be many of the leaders of the post-war radio astronomy efforts, including Martin Ryle. At the Telecommunications Research Establishment, Bolton first worked on developing a new airborne radar system operating at a wavelength of 3 cm, which included extensive testing during flights. By the time of the D-day landing, Bolton had grown tired of inflight testing radar. He was offered a position as radio officer on the British light aircraft carrier . Such a position made Bolton responsible for all airborne electronics, ship-to-aircraft communications, and navigational aids. As a support ship, had a reasonably safe war experience, with no major damage reported. Bolton's experience on is credited with developing his on hands-on expertise with electronics and the ideas that would help him later to build a sea-cliff interferometer. As World War 2 ended in 1945, shuttled cargo and personnel in the Pacific theatre back to Australia. When the returned to Britain in December 1945, Bolton decided to remain in Sydney. The choice to make Australia his new home was largely due to the positive influence the climate had on his health but also because his application to enrol in postgraduate studies at the Cavendish Laboratory at Cambridge University had been rejected. His abbreviated wartime undergraduate degree was deemed inadequate training for postgraduate study by the head of the Cavendish Laboratory, Lawrence Bragg. CSIR, Cygnus, and the sea-cliff interferometer After leaving the Navy, Bolton searched for a job through his Navy connections in Australia. Through one government official associated with finding work for veterans, an appointment was made for Bolton to meet Taffy Bowen, the head of Radiophysics Laboratory of CSIR. Bolton was soon appointed to the new research officer position, with duties of `research and development in connection with the application of radar techniques'. The expertise in radar technology by the Radiophysics Laboratory was world-class at the time, largely because Britain had shared the secret of radar with its Dominions as World War 2 began and due to a relatively large Australian radio physics community that had intimate ties with the ionospheric physicists in England. Bolton was first assigned to measure