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| Keywords: Arthur Jeffrey Dempster - Portrait.jpg en Portrait of Arthur Jeffrey Dempster middle 20age; 20profile; 20eyeglasses; 20working 20with 20equipment 20 20Arthur 20J 20Dempster 20discoverer 20of 20uranium 20235 20and 20professor 20of 20physics 20at 20the 20University 20of 20Chicago 20was 20a 20specialist 20in 20the 20nucleus 20of 20the 20atom 20He 20perfected 20a 20weighing 20method 20by 20means 20of 20which 20he 20has 20discovered 20atoms 20of 20differing 20weight 20 isotopes 20in 20elements 20previously 20believed 20to 20have 20uniform 20atomic 20weights 20The 20precise 20weight 20of 20the 20isotopes 20is 20the 20basis 20for 20calculating 20the 20energy 20set 20free 20in 20nuclear 20reactions 20Prof 20Dempster 20also 20achieved 20a 20reputation 20as 20the 20principal 20American 20authority 20on 20positive 20rays 20 credit University 20of 20Chicago 20Dept 20of 20Public 20Relations 20AIP 20Emilio 20Segre 20Visual 20Archives photoDate null storePublished Y color null names Dempster 20Arthur 20Jeffrey contactID null Emilio Segrè Visual Archives Author 1925-1930 DEFAULTSORT Dempster Arthur Jeffrey Black and white photographic portraits of male scientists Physicians from the United States 1886 births 1950 deaths PD-old | ||||
