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Which of the following step should be required for temporary adjustment of theodolite?
Levelling
Centering
Elimination of parallax
All of the above
All of the above
Temporary adjustments of a theodolite refer to the essential procedures performed at every instrument station to prepare it for observation. These steps are centering, leveling, and the elimination of parallax, which collectively ensure that the instrument is plumbed, leveled, and that the image of the target is formed precisely on the reticle plane.
Temporary adjustments of a theodolite refer to the essential procedures performed at every instrument station to prepare it for observation. These steps are centering, leveling, and the elimination of parallax, which collectively ensure that the instrument is plumbed, leveled, and that the image of the target is formed precisely on the reticle plane.
╧╡pтАЛ=0 тАФ The goal is to reduce the parallax error ╧╡pтАЛ to zero by adjusting the focus until image and reticle are coplanar.
Centering establishes the horizontal position of the instrument.
Leveling establishes the verticality of the instrument's axis.
Elimination of parallax ensures accuracy in sighting targets.
These adjustments are called 'temporary' because they must be repeated every time the theodolite is moved to a new station.
Ensures high precision in angular measurements.
Prevents systematic errors caused by misaligned instrumentation.
Time-consuming if the ground is uneven.
Requires significant practice to achieve efficiently.
Traversing in land surveying.
Triangulation and control surveying.
Topographical mapping.
Temporary adjustments are contrasted with 'Permanent Adjustments', which are required only when the fundamental geometric relationships between the instrument's components are disturbed (e.g., axis of plate levels perpendicular to the vertical axis).
Failing to eliminate parallax results in erroneous readings as the line of sight shifts with the observer's eye movement.
D is correct тАФ All listed steps (centering, leveling, and elimination of parallax) are essential components of the temporary adjustment process for a theodolite.
Always remember that temporary adjustments refer to the instrument setup, whereas permanent adjustments refer to the physical factory-calibrated relationships between axes.