3/2/2023 0 Comments Check collamination achromathe difference between the sum of back sights of fore sights should be equal to the difference of the Ist and last R.Ls.Ĥ. There are two checks for arithmetical accuracy i.e. There is no check on the R.Ls of intermediate stations.ģ. In the case of more intermediate readings, there is considerable saving of labour and time as it involves only a few calculations.Ģ. of each point is then found by adding rise or subtracting fall to or from the R.L. The difference of their staff reading indicates rise or fall according as any staff reading is smaller or greater than that at the preceding point. In this method, the difference between consecutive points is calculated by comparing each point after the first with that immediately preceding it. This method may more clearly be understood by the following example of longitudinal levelling from flag – staff lower base to downstream parapet of culvert no. There is no check on the reduction of R.Ls. of the planes of collimation and of the change points only. This check verifies the calculation of R.Ls. The difference between the sum of the back sights and the sum of the fore sights should be equal to the difference of the first and the last R.Ls i.e. The process is repeated until all the R.Ls are worked out, and then the arithmetical check is applied. The reduced levels of the successive points and the second change point arc found out by subtracting their staff readings from this new H.I.
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