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The electron was first discovered in 1898 by Sir John Joseph Thomson. Almost 100 years ago J.J. Thomson was at Cavendish Laboratory at Cambridge University. Thomson was investigating 'Cathode Rays' which had been a puzzle for a long time.
PHY 192 Charge and Mass of the Electron Spring 2012 1 Mass of the Electron Motivation for the Experiment The aim of this experiment is to measure the mass of the electron. The mass will be deduced from a measurement of the charge to mass ratio, e/m, combined with a value for the charge taken from elsewhere. Table I gives the values for the mass and charge of the electron for comparison purposes.