Define the following terms i Benchmark ii Back sight iii Foresight iv Reduced level

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Define the following terms: i) Benchmark ii) Back sight iii) Foresight iv) Reduced level

Explain in point vice


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 i) Bench mark; A permanent reference object to which the measurements are considered.
ii) Back sight: It is sight taken on a level staff held at a point of known elevation with an intension of determining plane of collimation or sight.
The sight is also known as +ve sight (add)
iii) Fore sight (F.S): This is the last reading taken from instrument just before shifting the instrument. This is also ve sight.
iv) Reduced level: Reduced level of a point is the level of the point with respect to assumed datum.


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