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  2. Temporary adjustments of theodolites - Wikipedia

    en.wikipedia.org/wiki/Temporary_adjustments_of...

    The initial setting operation includes fixing the theodolite on a tripod, along with approximate levelling and centering over the station mark.For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation).

  3. Permanent adjustments of theodolites - Wikipedia

    en.wikipedia.org/wiki/Permanent_adjustments_of...

    The permanent adjustments of theodolites are made to establish fixed relationship between the instrument's fundamental lines. The fundamental lines or axis of a transit theodolite include the following:- Vertical axis; Axis of plate levels; Axis of telescope; Line of collimation; Horizontal axis; Axis of altitude bubble and the vernier should ...

  4. Theodolite - Wikipedia

    en.wikipedia.org/wiki/Theodolite

    The pibal theodolite uses a prism to bend the optical path by 90 degrees so the operator's eye position does not change as the elevation is changed through a complete 180 degrees. The theodolite is typically mounted on a rugged steel stand, set up so it is level and pointed north, with the altitude and azimuth scales reading zero degrees.

  5. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    The complete unit is normally mounted on a tripod, and the telescope can freely rotate 360° in a horizontal plane.The surveyor adjusts the instrument's level by coarse adjustment of the tripod legs and fine adjustment using three precision levelling screws on the instrument to make the rotational plane horizontal.

  6. Tripod (surveying) - Wikipedia

    en.wikipedia.org/wiki/Tripod_(surveying)

    This shows a surveyor's tripod's foot. The platform is used to push the spike into the ground. Above the foot is the height adjustment. The tripod is placed in the location where it is needed. The surveyor will press down on the legs' platforms to securely anchor the legs in soil or to force the feet to a low position on uneven, pock-marked ...

  7. Total station - Wikipedia

    en.wikipedia.org/wiki/Total_station

    A total station or total station theodolite is an electronic/optical instrument used for surveying and building construction. It is an electronic transit theodolite integrated with electronic distance measurement (EDM) to measure both vertical and horizontal angles and the slope distance from the instrument to a particular point, and an on ...

  8. Tacheometry - Wikipedia

    en.wikipedia.org/wiki/Tacheometry

    A theodolite is used to measure the horizontal angle between indicators on the two ends of the subtense bar. The distance from the telescope to the subtense bar is the height of an isosceles triangle formed with the theodolite at the upper vertex and the subtense bar length at its base, determined by trigonometry .

  9. Adjustments of theodolite - Wikipedia

    en.wikipedia.org/wiki/Adjustments_of_theodolite

    Adjustments of theodolite may refer to: Permanent adjustments of theodolite; Temporary adjustments of theodolite; See also. Adjustment computations