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March 22, 1868

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1891: graduated from Oberlin College

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1895: Received doctorate at Columbia University

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1896: Assistant at University of Chicago

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1910: Gets more precise with the oil drop experiment
(replaced the water with oil)

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1921 - Becomes director of the Norman Bridge Laboratory of Physics at Caltech 

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1921 - Becomes director of the Norman Bridge Laboratory of Physics at Caltech 

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Becomes chairman of the executive council of Caltech

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Becomes chairman of the executive council of Caltech

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1921 - 1945

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1909: series of experiments to find the electric charge in an electron

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1910: Full professor

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At Caltech he proved radiation is indeed of extraterrestrial origin

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At Caltech he proved radiation is indeed of extraterrestrial origin

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Named "Cosmic rays"

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Obtained exact value of Planck's constant

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Obtained exact value of Planck's constant

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for his study of the elementary electronic charge and the photoelectric effect

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December 19, 1953

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The Editors of Encyclopaedia Britannica. "Robert Millikan." Britannica, Encyclopædia Britannica, 18 Mar. 2020, www.britannica.com/biography/Robert-Millikan.