In 1911 he (independently of Millikan) determined the electron charge, using charged microparticles of metals balanced in electric field against gravity (published in 1913).
Hale put forward the idea that the seismological lab could be integrated into the university's new geology department and soon thereafter the university's president, Robert A. Millikan, officially accepted the proposal and a new building away from the main campus was set up for the station which was eventually called the Caltech Seismological Laboratory.
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Under a National Research Council fellowship, Bitter studied gases at Caltech with Robert Andrews Millikan, from 1928 to 1930.