Robert Millikan, US physicist

Robert Millikan, US physicist

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Credit: LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY

Caption: Robert Andrews Millikan (1868-1953), US physicist. Millikan studied Classics as an undergraduate, but he then developed an interest in physics, gaining a doctorate from Columbia University in 1895. In Chicago between 1909 and 1913 he determined the charge on an electron by introducing charges onto oil droplets between charged plates. Millikan found the charges always to be multiples of a single value; the charge on an electron. He also made an accurate measurement of Planck's constant. He was awarded the Nobel Prize for Physics in 1923 for his work in measuring the charge of the electron. This photograph is from the Bain News Service, one of the USA's earliest news picture libraries.

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