The Discovery of Subatomic Particles
The Discovery of Subatomic Particles Steven Weinberg I. W. H . Freeman and Co mpa ny NE W Y ORK Staff and students at the Cavendish Laboratory, 1933 . Fourth row: J. K. Roberts, P. Harteck, R. C. Evans, E. C. Childs, R. A. Smith, Top row: W. ]. Henderson , W. E. Dun canson, P. Wright, G. E. Pringle, H. Miller. G. T. P. Tarr ant , L. H. Gray, j . P. Gort, M. L. Oliphant , P. I. Dee, ]. L. Pawsey, Second row: C. B. O. Mohr, N. Feath er, C. W. Gilbert , D.Shoenberg, D. E. Lea, C. £. Wynn-Williams. R. Witty, - -Halliday, H . S. W. Massey, E.S. Shire. Seated row: - - Sparshotr, J. A.Ratcliffe, G. Stead, J. Chadwick, G. F. C. Searle, Third row : B. B. Kinsey, F. W. Nicoll, G. Occhialini, E. C. Allberry, B. M. Crowt her, Professor Sir J. J. Thomson, Professo r Lord Ruth erford, Professor C. T. R. Wilson, B. V. Bowden, W. B. Lewis, P. C. Ho, E. T. S. Walton, P. W. Burbidge, F. Bitter. C. D. Ellis, Professor Kapirza, P. M. S. Blackett , - - Davies. 13 2 The Discovery of the Electron This century has seen the gradual realization that all matter is composed of a' f~w type s of elementary particles-tiny units that apparently cannot be subdi vided further. The list of elementary particle types has changed many times dunng the century, as new particles have been discovered and old ones have been found to be composed of more elementary constituents. At latest count there are some sixteen known types of elementary particles.
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