In October 1939, Chadwick received a letter from Sir Edward Appleton, the Secretary of the Department of Scientific and Industrial Research, asking for his opinion on the feasibility of an atomic bomb.
查德威克於1939年10月收到一封從科學及工業研究部部長愛德華·阿普爾頓爵士的信件，請教他對原子彈可行性的意見。