The invention of the capillary electrometer.

definitions

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.”[1]
Electrocapillarity is “a change in the surface tension of a liquid caused by an electric field at the surface.”[2]

INVENTION

The Luxembourg-born French physicist Jonas Ferdinand Gabriel Lippmann invented the capillary electrometer and discovered electrocapillarity in 1872.
Here is a labelled drawing[3][4] of his capillary:

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inventor

Here is a photograph[5] of Gabriel Lippmann:

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1845-1921

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sources
  1. https://encyclopedia2.thefreedictionary.com/capillary+electrometer
  2. https://encyclopedia2.thefreedictionary.com/electrocapillarity
  3. http://www.elch.chem.msu.ru/portret/electrocapillarity/Lippmann/1875_5_5.pdf, page 532.
  4. https://en.wikipedia.org/wiki/Lippmann_electrometer
  5. https://www.nobelprize.org/prizes/physics/1908/lippmann/biographical/




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