Pivot arm anemometer

{
  "id": "MLC-T-MET-010671",
  "term": "Pivot arm anemometer",
  "field": "Meteorology and atmospheric science",
  "definition": "An instrument that measures wind speed based on the deflection of a pivoting arm or plate exposed to the wind. The force of the wind pushes against a flat plate or a similar object attached to a hinged arm, causing it to swing upwards or sideways against the force of gravity or a spring. The angle of deflection is proportional to the wind pressure, from which the wind speed can be derived and displayed on a calibrated scale.",
  "url": "https://mlchart.com/terminology/meteorology/pivot-arm-anemometer/"
}