A capillary electrometer (also known as a Lippmann electrometer) is “an electrometer designed to measure a small potential difference between mercury and an electrolytic solution in a tube by measuring the effect of this potential difference on the surface tension between the liquids.”
Electrocapillarity is “a change in the surface tension of a liquid caused by an electric field at the surface.”
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Here is a photograph of Gabriel Lippmann:
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- http://www.elch.chem.msu.ru/portret/electrocapillarity/Lippmann/1875_5_5.pdf, page 532.