[Correspondence] 1938 Jun 10 - Aug 26 [between] Prof. J. Chadwick, George Holt Physics Laboratory, University of Liverpool [and] F.A.B. Ward, Science Museum, London. [9 items on 9 leaves; Ward's are ts. copy letters; Chadwick's are ts. signed or holograph signed. Chiefly concerning supply of copies of E.O. Lawrence's colour slides, needed by Chadwick; also include discussion of Lawrence's cyclotron and of Chadwick's cyclotron (now nearing completion)]