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Thursday, December 25, 2008

what are the INSTRUMENTS USED FOR TACHEOMETRY

Theodolite






Is an instrument for measuring both horizontal and vertical angles



Prism for leveling



The prism is used to return the transmitted beam to the instrument to allow a distance to be determined by time of flight or phase comparison.



Tripod

Tripod is an adjustable three legged stand, as for supporting theodolite, prism etc.




Measuring tape

It is used to measure the distance between two stations.




Staff

A leveling staff is the equivalent of a long ruler and it enables distances to be measured vertically from the horizontal plane established by a level to points where heights are required.



Staff bubble

The Staff bubble is attached to the level staff while taking level readings. The staff bubble should be centered in the circle as shown in the picture here. A centered staff bubble indicates that the staff is being held vertical and accurate staff readings can be made at this time.

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