Alidade

{
  "id": "MLC-T-OAG-000092",
  "term": "Alidade",
  "field": "Oil and gas",
  "definition": "A sighting device used in conjunction with a plane table for topographic mapping and geological surveying. It consists of a ruler with a sighting mechanism, such as a telescope or open sights, mounted on it. The alidade is used to draw lines on the plane table that correspond to lines of sight to distant objects, aiding in the creation of geological maps.",
  "subject": "Geology",
  "url": "https://mlchart.com/terminology/oil-and-gas/alidade/"
}