Correspondence of Professor James Chadwick (regarding the cyclotron) with Bernard B. Kinsey (Department of Physics, University of California, Berkeley), Professor Ernest O. Lawrence (Department of Physics, University of California, Berkeley), Henry W. Newson (Department of Chemistry, University of Chicago), Malcolm C. Henderson (Palmer Physical Laboratory, Princeton University), Dr. J.D. Cockcroft (University of Cambridge), Dr. W.H. Hatfield (Atlas and Norfolk Works, Sheffield), G.H. Nisbett (British Insulated Cables Ltd., Prescot), and Professor E.W. Marchant (Department of Applied Electricity University of Liverpool).

Also photograph of a cyclotron magnet; paper on Recent Developments in Cyclotron Technique n.d; diagrams; and British Insulated Cables Ltd., Prescot’s advices of despatch of soft copper straps, 1936.

Together with Dr. King’s calendar of these letters, etc; transcript of Dr. Cockcroft’s handwritten letters to Professor Chadwick; and list of the correspondence in chronological order; 1995-96.