Q2 (a) In Stadia tacheometry, the graduated staff may be hold either vertically or at right to the line of sight. Compare the relative merits of above two methods of holding staff. [4 Marks) (b) In order to determine the horizontal distance and the level difference between two points A and 8 in a hilly area, tacheometric observations have been made to them from two stations P and of a traverse conducted at the foot of the hill. The points A and B were sighted from station P and Q respectively. The staff was held vertically at both points. The instrument had an analytical lens with constant 100. Table Q2 Instrument station P Reduced level of the station (m) 64.20 62.50 Coordinates of station (m) 40.72N, 51.60E 31.24N, 90.35E Instrument height (m) 1.45 Staff station Whole circle bearing 42 30' 85000 Vertical circle reading (+) 1600 (+) 12 20' Stadia readings (m) 0.820, 1.060, 1.300 1.600, 1,915, 2.230 i) Find the level difference between pints A and B. (8 Marks) ii) Determine the horizontal distance between A and B. [8 Marks] 1.52 A B