Question

Define reciprocal leveling

Answer 1

levelingbetween two widely separated points in which observations are made in both directions to eliminate the effects of atmospheric refraction and the curvature of the earth.

(or)

A levelling procedure used when long sights are required (over rivers, ravines, or obstacles) to minimize *collimation, * 

Answer 2

leveling between two widely separated points in which observations are made in both directions to eliminate the effects of atmospheric refraction and the curvature of the earth.