The following staff reading were observed successfully with level, he instrument having been moved forward after the second, fourth and eighth readings. 0.875 , $1.235,2.310,1.385,2.930,3.125,4.125,0.120,1.875,2.030,3.765$. The first reading was taken with the staff held upon a bench mark of elevation 100.000 Enter the readings in level book - form and reduce the levels. Apply the usual checks. Find the difference in elevation between the first and las points. OR
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