The following consecutive readings were taken with a dumpy level : 0.695. 1.525, 2.395, 0.635, 0.605, 0.805, 0.125 . The instrument was shifted after the third and fifth readings. The readings 2.395 and 0.635 respectively represent where F.S. is foresight, B.S. is backsight and I.S. is intermediate sight.
