Definition of quadrant electrometer in English:

quadrant electrometer

noun

Electricity
  • An electrometer in the form of a broad, shallow metal cylinder composed of four mutually insulated quadrants, within which there is a suspended needle or vane which turns when a voltage is applied to some of the quadrants when the others are earthed.

Origin

Late 18th century; earliest use found in Tiberius Cavallo (1749–1809), natural philosopher.