Question no.12 The following consecutive readings were taken with a dumpy level along a chain line at a common interval of 15 m. The R.L. of B.M. is 150. The instrument was shifted after the fourth and ninth readings. 3.450, 2.54, 1.25, 0.75, 3.25, 2.50, 1.85, 1.45, 1.95, 1.50, 2.50 and 3.05 m. Find the R.L. of all points by rise and fall method.

Surveying is the practice that determines the relative three-dimensional positions of many different points on the earth’s surface. There are various instruments used in Surveying like Theodolites, Total station, Tripod stands, Plane table, etc. for meas…