51) What level is required for permanent adjustment if the bubble axis made parallel to collimation axis of the telescope?

52) What is the difference of level if dumpy level is at mid point C Staff reading on A = 1.580m Staff reading on B = 1.220m?

53) What is the height of collimation if reduced level of point A= 100.000m. Back sight at point A = 2.750m?

54) What is R.L of point, if the height of collimation level 103.450m and inter sight reading on point 1=2.680m?

55) What is rise or fall, if back sight reading taken on B.M is 2.045m and inter sight on point =2.68m?