Manchester-born Sir Joseph John Thomson (1858-1940), discoverer of the electron, was one of the most important Cambridge physicists of the later nineteenth and first half of the twentieth centuries. Succeeding Lord Rayleigh as Cavendish Professor of Experimental Physics, he directed the research interests of the laboratory, and eight of his students, including Rutherford, went on to win Nobel Prizes, as Thomson himself did in 1906. He was knighted...