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Reciprocal levelling is done to test a dumpy level, along a chain line, at a common...

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Civil Engineering

Reciprocal levelling is done to test a dumpy level, along achain line, at a common interval of 15m, starting at 135 m. Thefollowing records have been observed with the instrument shifts atdistances of 180 m and 240 m:

3.400, 2.315, 1.350, 0.755, 3.305, 2.880, 1.745, 1.470, 1.910,1.355, 2.450 and 3.035 m

Calculate the reduced levels at all the points and check formathematical errors, assuming RL = 97.935 m is the bench markreading at the first station. Use both a) the rise and fall method,and b) the height of collimation method.

Reciprocal levelling is done to test a dumpy level, along achain line, at a common interval of 15m, starting at 135 m. Thefollowing records have been observed with the instrument shifts atdistances of 180 m and 240 m:

3.400, 2.315, 1.350, 0.755, 3.305, 2.880, 1.745, 1.470, 1.910,1.355, 2.450 and 3.035 m

Calculate the reduced levels at all the points and check formathematical errors, assuming RL = 97.935 m is the bench markreading at the first station. Use both a) the rise and fall method,and b) the height of collimation method.

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