Measurement of the elementary electric charge.- Millikan (Robert Andrews) "A New Modification of the Cloud Method of Determining the Elementary Electrical Charge and the Most Probable Value of that Charge", in The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Sixth series, vol. 19, 2 plates (1 folding), diagrams, illustrations and tables in text, original printed wrappers, neatly and sympathetically rebacked, 8vo, Taylor and Francis, 1910.

⁂ MIllikan's famous oil drop experiment that provided the first definitive proof that electric charge is made up of elementary indivisible quantities, and that the charge is not a statistically averaged quantity. From this experiment the value of the electron charge could be readily determined. For his study of the electronic charge and the photoelectric effect, Millikan won the 1923 Nobel Prize for Physics.