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What is Two Peg Test for Collimation Error about?
The Two Peg Test is used to determine the collimation error of a level instrument. It involves taking readings at the midpoint between two pegs and near one of the pegs. The difference between the elevation differences from the two setups equals the collimation error over the horizontal distance. For example, if the horizontal distance is 60m and the elevation difference is off by 0.006m, then the collimation error per unit length is 0.0001m/m. The correction to rod readings for any horizontal distance can
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