Laboratory Notebooks The notebooks are presented in chronological order as far as possible. They are all in Blackett's hand, unless otherwise indicated; other hands are identified were known. The notebooks provide a record of Blackett's first research at the Cavendish Laboratory under Rutherford (B.2-4), his year at Gottingen with Franck (B.10-12) and his collaborative work with research students E.P. Hudson (B.13), F.C. Champion (B.17-18) and D.S Lees (B.15, B.19-20) in Cambridge. Several incomplete sequences (B.5-6, B.17-18) indicate that some notebooks have not survived. Sometimes pages have been torn from the notebooks and kept with the working notes. 1920-1932