Finding Collimation Error of a Level using Two Peg Test Method|Solved Problem

In this video we will learn how to find collimation error of a level using Two Peg Test Method and then find the corrected staff readings. #civilengineering #feexam #levelling #surveying #gateexam Question: When carrying out the permanent adjustments of a dumpy level by two-peg method, the following observation were made. Instrument at E midway between C and D, 100 m apart. Reading at point C = 2.0 m Reading at point D = 3.0 m Instrument at F in line of CD such that CF = 120 m and DF = 20 m. Reading at point C = 1.50 m Reading at point D = 2.75 m Check whether the instrument needs permanent adjustments or not, and whether the line of sight is inclined downwards. What should be the correct reading at C and D if the instrument is to be adjusted?