R A Millikan

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It was as early as 1903 that the British physicists, McLennan and Burton' and Rutherford and Cooke2 noticed that the rate of leakage of an electric charge from an electroscope within an airtight metal chamber could be reduced as much as 30% by enclosing the chamber within a completely encircling metal shield or box with walls several centimeters thick. This(More)
In the fall of 1913, while studying the photo-electric properties of freshly cut surfaces of the alkali metals in extreme vacua, we observed that immediately after first cutting, the fresh surface of sodium showed very large photo-sensitiveness when tested with monochromatic light of wave length 5461 A., even when the vacuum was of the order 10-6 mm. as(More)