'Scientists at the Operational Level - Notes on the Statement to Admiralty Panel on 16.9.41 on the function of an Operational Research Station' These are based on the talk given to senior staff at the Admiralty, in which Blackett explains how 'the scientist can encourage numerical thinking on operational matters, and so can help to avoid running the war by gusts of emotion' The talk and document led to Blackett's appointment as Chief Adviser Operational Research with effect from 10 December 1941. See also A.16. Included here is a letter agreeing to allow Blackett 'the full services of Dr Bullard as your Deputy'. The letter is dated 23 April 1942 and stipulates that Bullard should continue certain other work as 'we need somebody of Bullard's calibre to hold things together' 1941