Surveying
The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

closer to the lower station
closer to the higher station
equidistant from A and B
as far as possible from the line AB

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Surveying
Theodolite is an instrument used for

measurement of both horizontal and vertical angles
tightening the capstan-headed nuts of level tube
measurement of vertical angles only
measurement of horizontal angles only

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