Quadrant electrometer

{
  "id": "MLC-T-MET-008233",
  "term": "Quadrant electrometer",
  "field": "Meteorology and atmospheric science",
  "definition": "An electrostatic instrument used to measure small electrical charges or potentials, historically employed in atmospheric electricity studies. It consists of a light metal vane suspended within four charged quadrants, with its deflection indicating the potential difference. This device was instrumental in early investigations of atmospheric electric fields.",
  "url": "https://mlchart.com/terminology/meteorology/quadrant-electrometer/"
}