-the vertical line of the line plate must be in the centreof the levelling rod. -the basic curve goes through the whingmark of the leveling rod. -the levelling rod reading for the distance is the pitch of the basic curve to the distance curve. -the height reading is from the basic curve to the distance curve. -before reading of the height difference must be horizontal in the height index level - |
Axis of the
theodolite V = vertikal axis K = horizontal axis Z = axis L = axis of horizontal level |