Grid nephoscope

{
  "id": "MLC-T-MET-006074",
  "term": "Grid nephoscope",
  "field": "Meteorology and atmospheric science",
  "definition": "An instrument used to determine the direction and speed of cloud movement by observing the apparent motion of clouds against a grid pattern. The observer aligns the grid with the cloud's movement and measures the time it takes for a cloud feature to cross a certain number of grid squares. This device provides visual estimates of cloud velocity.",
  "url": "https://mlchart.com/terminology/meteorology/grid-nephoscope/"
}