60-inch cyclotron, c 1930s.
UNITED STATES - NOVEMBER 15: 60-inch cyclotron, c 1930s. This shows the cyclotron at the Lawrence Radiation Laboratory, Berkeley, sonn after completion in 1939. The key figures in its development and use are shown, standing, left to right: Dr D Cooksey, Dr D Corson, Dr EO Lawrence (1901-58), the inventor of the cyclotron, Dr R Thornton, Dr J Backus, WS Sainsbury, Dr LW Alvarez (1911-88) and Dr EM McMillan (1907- ). Copyright American Institute of Physics (AIP). (Photo by Science & Society Picture Library/SSPL/Getty Images)