Abstract
A. GILT cork ball, about 1 cm. in diameter, is attached by sulphur to a vertical straw about 28 cm. in length. The lower end of the straw is fastened by sulphur to the centre of a circular cardboard tray about 5 cm. in diameter, in which is a ring of lead. The tray is put on a watch glass which floats on the surface of mercury in a large flat dish. (A developing dish about 30 cm. by 26 cm. was used, but a shallow wooden trough made for the purpose would be better.) In this way the gilt ball is able to move fairly freely in a horizontal plane. This float arrangement is kept in a bell-jar desiccator when not in use.
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D'ARCY, R. An Experiment for Showing Lines of Force in an Electrostatic Field. Nature 91, 59 (1913). https://doi.org/10.1038/091059b0
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DOI: https://doi.org/10.1038/091059b0
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