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Surveying involves the measurement of lot of readings. Local attraction is one of the important concept of surveying. Bearings of lines are measured and they depends on magnetic meridian which gets affected by magnetic forces at site. So, calculations need to be done separately to rectify the readings of bearings. Without a further delay, let's how all these calculations can be done properly so as obtained correct readings of bearings of line. What is Local Attraction? A magnetic meridian at a place is established by a magnetic needle which is uninfluenced by other attracting forces. Some of the sources of this effect are: magnetite in the ground, wire carrying electric current, steel structures, railroad rails, underground iron pipes, keys, steel-bowed spectacles, metal buttons, axes, chains, steel tapes etc.​ The local attraction at a particular place can be detected by observing the fore and back bearings of each line and finding its difference.​ If Differen

Surveying is one of the most important aspect of civil engineering. It involves the assessment of site and recording details about land. Measurement of angles, vertical and horizontal distance between points all these data help us to plan construction projects. The main principle of surveying is working from whole to part i.e., It is very essential to establish first a system of control points and to fix them with higher precision. Minor control points can then be established by less precise methods and the details can then be located using these minor control points by running minor traverses etc . It is for the prevention the accumulation of errors and to control and localize minor errors. Surveying is a method to determine relative position between two points on, above or beneath the earth surface and it also includes the art of establishing by predetermined angular and linear measurements. Levelling is a branch of surveying in which elevations of points are