Harris's Balance Electrometer, 1834.

Harris's Balance Electrometer, 1834.
4 0 c m
actual image size: 18cm x 32cm


Sir William Snow Harris (1791-1867) designed this instrument to compare the quantity of electricity imparted to a substance with its attractive power. In an experiment similar to Van Masenbroek's concerning magnetism a century before, he weighed the force of the electric attraction on a balance.

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© Royal Institution / Science & Society Picture Library

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