Britain's Atomic Scientists Invite The Press -- Professor Nevill F. Mott (left) of Bristol University, and Professor Harold C. Urey, Nobel Prize winner for the discovery of heavy water essential to the making of the atomic bomb, photographed at to-day's London meeting. Members of Britain's Atomic Scientists' Association, limited to 50 members each of whom has made a distinguished name in atomic research work, met in Old Burlington Street, London, this evening, Thursday, to hear two of the World's leading atomic experts, Profesor Nevill F. Mott, the Association's President, of Bristol University, and Professor Harold C. Urey, internationally Known United States' scientist. December 12, 1946.