Group photographs including R H Brown Photograph one shows E G Bowen, A L Hodgkin and Hanbury Brown having a pub lunch at Worth Matravers, 1940. Photograph two shows J G Bolton and Hanbury Brown socialising at the 10th General Assembly of URSI in Sydney, August 1952. Bolton and Hanbury Brown became members of an URSI sub-committee that was set up on this occasion to furnish a special report on discrete sources of galactic noise. Photograph three, a photograph of a meeting hosted by the CSIRO Division of Radiophysics in November 1977, is accompanied by a compliments slip listing the names of those shown in the picture. The Division of Radiophysics of CSIRO (the Commonwealth Scientific and Industrial Research Organisation) was located in Epping, a suburb of Sydney, also the headquarters of the Anglo-Australian Telescope which had opened in 1974. Photograph four shows E G Bowen and Hanbury Brown socialising with two unidentified colleagues, possibly at a conference on the history of radar in 1985. A conference on 'The history of radar development' was hosted by the Institution of Electrical Engineers (IEE) in its London headquarters in June 1985. 1940-1985