Short notes and correspondence re Blackett's service at Imperial College Correspondence re renewal of Blackett's appointment as Senior Research Fellow, October 1971-September 1974. 1971 Notices of seminars, colloquia etc. Correspondence re renewal of Blackett's appointment as Senior Research Fellow until September 1977 Correspondents include: JRD Francis, Walter Hayman, Paul Matthews and William Penney (Baron Penney of East Hendred). 1970-1974