Correspondence re Blackett's Tizard Memorial Lecture, 1960 Correspondents: Sir Harold Hartley, AV Hill (comments on draft, recollections of wartime events and controversies. Includes a copy of a letter from Tizard to Hill, 18 June 1936 about the presence of Lindeman on the 'Tizard Committee', and on early radar trials. See also J.35). Correspondents also include: Derek Dempster, 1960