Biographical material includes Fowler's personal file from the Department of Physics at the University of Bristol and other documents relating to his career, honours and awards including his Royal Society Fellowship and Research Professorship. There is also historical material relating to C.F. Powell. Substantial records in the form of lecture notes survive of the undergraduate studies of Fowler and Rosemary Brown in the Bristol Physics Department in the 1940s. Other University of Bristol material includes correspondence, agendas, minutes and reports relating to a number of university committees on which Fowler served. The bulk of the documents, however, are records of the many microscope observers, scanners, balloon makers and technicians employed by the H.H. Wills Laboratory in cosmic ray research.
There is a sequence of material relating to balloon flights for cosmic ray studies arranged in chronological order. Nearly all the material dates from the 1960s and covers various balloon flight launches worldwide including Palestine, Texas (USA), 1960, 1966-1969, Fort Churchill (Canada), 1965, and Hyderabad (India), 1965. It includes correspondence and papers relating to arrangements for flights, balloon technical specifications, flight plans, proposals and analysis of results. Other research interests documented include pi-mesons in cancer treatment, magnetic monopoles, the heavy primary cosmic ray detector for the Ariel 6 satellite and the assessment of the radioactive fallout from the Ukrainian nuclear plant Chernobyl, ten years after its explosion.
There is a chronological sequence of material relating to publications, 1947-ca 1996, including offprints, drafts, figures and correspondence. There are records of physics teaching at Bristol in the 1950s and 1960s and Fowler's public and invitation lectures, principally on cosmic rays, 1964-1996. Visits and conferences material is presented for the period 1956-1993. Visits documented are Fowler's Visiting Professorship at the University of Minnesota in 1956-1957, the Royal Society of New Zealand Rutherford Memorial Lecture Tour in 1971 and IUPAP International Cosmic Rays Conferences.
Fowler's involvement with seventeen UK and international organisations is documented. Particularly well represented are the International Union of Pure and Applied Physics for which Fowler was a UK delegate to IUPAP conferences, the Joint MRC/NRPB Committee on Radiological Protection (Chairman 1983-1992), the Royal Astronomical Society, the Royal Society (documenting Fowler's service on various British National Committees) and the Science and Engineering Research Council (Chairman of the Neutron Beam Review Panel). Non-scientific organisations he served were the Herschel House Trust, Bath (Chairman), King's School in Bruton, Somerset (Governor) and the Nehru Memorial Trust (Trustee). There is also documentation of Fowler's consultancy with Rolls-Royce plc and Track Analysis Systems Ltd (TASL) of which he was a director.
There is an alphabetical sequence of correspondence following Fowler's original arrangement. Correspondents are mainly scientific colleagues and historians of science, though there are no extended exchanges.