Robert A. Millikan

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Scientific Biographies

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Robert A. Millikan

During World War I, Millikan was Vice-Chairman of the National Research Council, playing a major part in developing anti-submarine and meteorological devices. In 1921, he was appointed Director of the Norman Bridge Laboratory of Physics at the California Institute of Technology, Pasadena; he was also made Chairman of the Executive Council of that institute. In 1946 he retired from this post. Professor Millikan has been President of the American Physical Society, Vice-President of the American Association for the Advancement of Science, and was the American member of the Committee on Intellectual Cooperation of the League of Nations, and the American representative at the International Congress of Physics, known as the Solvay Congress, at Brussels in 1921.


o Verified Einstein’s photoelectric equationo Made the first direct photoelectric determination of Planck's constant ho His studies of the Brownian movements in gases put an end to all opposition to the atomic and kinetic theories of mattero The hot-spark spectroscopy of the elements (which explored the region of the spectrum between the ultraviolet and X-radiation), thereby extending the ultraviolet spectrum downwards far beyond the then known limito The discovery of his law of motion of a particle falling towards the earth after entering the earth's atmosphere, together with his other investigations on electrical phenomena, ultimately led him to his significant studies of cosmic radiationo During WWI, played a major part in developing anti-submarine and meteorological devices

Lasting Impact

The oil drop expierement


Robert a. millikan - biographical. (2013, NOVEMBER 27). Retrieved from andrews millikan. (2003). Retrieved from, A. (n.d.). Millikan oil drop experiment. Retrieved from, G. (2011, NOVEMBER). Timeline of the atom. Retrieved from

Robert Millikan

Outside Info

Oil Drop


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