8 26.1 Some important discoveries at the end of the 20th century JJ. Thomson(1856--1940) 826. 1 Some important discoveries at the end of the 20th century J J. Thomsons original tube2 J. J. Thomson (1856--1940) §26.1 Some important discoveries at the end of the 20th century J. J. Thomson’s original tube §26.1 Some important discoveries at the end of the 20th century