Surveyors Chain

Chain surveying is a fundamental, low-technology method of land surveying that relies on measuring linear distances with a chain or tape, rather than angles. The process divides an area into a network of triangles to calculate areas, often utilizing a plumb bob for precision on slopes and a calculator for processing field measurements.

Core Components of Chain Surveying:
Survey Chain: A metal chain, typically 20m or 30m (metric) or 66ft (Gunter’s), divided into 100 links used for direct distance measurement.
Plumb Bob: A pointed metal weight on a cord used to ensure the chain is held directly over a specific ground point, particularly crucial for measuring horizontal distances on sloped, uneven ground.
Calculator: Used to determine areas of triangles and trapezoids from field measurements, adjust for inaccuracies, and compute corrections for slope or chain errors.