n a two peg test using model Wild NA2 dumpy level, the following observations were taken:   Instrument at C Instrument at D Rod reading on A 1.103 m 0.568 m Rod reading on B 0.991 m 0.289 m Point C is equidistant from A and B and D is 12m from A and 72m from B. What is the true difference in elevation between A and B? With the level in the same position at D, to what rod reading on B should the line of sight be adjusted? What is the corresponding rod reading on A for a horizontal line of sight with instrument still at D?

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Methods of Surveying

Surveying is the practice to determine the relative three-dimensional positions of various points on the earth’s surface. This is done by computing the vertical and horizontal distances, angles between the points, collecting the observations, and plotting them on a map of any appropriate scale. Accuracy can be achieved by using the latest instruments like a theodolite, tachometer, etc. Leveling is a subdivision of surveying where the objective is to locate the elevation of objects considering a datum level.