General Product Name: Trough Compass
Size: Standard
Origin: India
Purpose & Usage Used for marking the magnetic north line on a plane table drawing sheet.
Helps align the plane table accurately with north–south and east–west directions.
Assists surveyors in sighting distant objects with known azimuths.
Ensures precise orientation of the plane table during field surveying.
How It Works The magnetic needle points to 0°–0° on the graduated scale.
A line drawn parallel to the compass edge represents the magnetic meridian.
Placed on the plane table to maintain accurate alignment and orientation.
This plane table surveying trough compass comes with a standard size construction and is manufactured in India. It features a magnetic needle that aligns to 0°–0° on the graduated scale, allowing a line drawn parallel to the compass edge to repres ...