Vertical Control by Hand Level

The similar principle as used in level and staff method is employed in this method also. This method is extremely rapid in comparison to the former method. A hand level or an abney might be used to get and denotes of the horizontal line from the eye of the observer. A level staff or a pole having zero mark at the height of the observer's eye that is graduated up and down from that point is used in this method. A man with the instrument stands over the benchmark and the staff man is moved to a point on the contour to be plotted. As soon as the man with instrument observes the required staff reading for a particular contour he instructs the staff man to stop and locates the position of the point.