Text: "Development of the physicist's conception of nature." Symposium on the development of the physicist's conception of nature. Ed. by Jagdish Merha. Ehrenhaft obtained fractional charges by working with red selenium spheres. He could vary the size of fractional charge by varying the size of the spheres. Millikan also reported one oil drop experiment in which a fractional charge was obtained. Millikan discarded the result as probably due to error. Boston: D. Reidel Publishing Company, 1973. p. 12-14.

See Also: Fractional charge, Ehrenhaft effect, electromagnetic theory, foundations of physics.

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