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In the theodolite, Two standards resemble letter A are mounted on the _________
Upper plate
Lower plate
Both A and B
None of the above
Upper plate
In a transit theodolite, the two standards (also called A-frames) are vertical supports that house the bearings for the trunnion axis of the telescope ┬╖ These standards are rigidly mounted on the upper plate (also known as the alidade plate) to ensure they rotate together with the horizontal circle assembly during surveying.
In a transit theodolite, the two standards (also called A-frames) are vertical supports that house the bearings for the trunnion axis of the telescope ┬╖ These standards are rigidly mounted on the upper plate (also known as the alidade plate) to ensure they rotate together with the horizontal circle assembly during surveying.
HAтАЛ=Elevation+Height┬аof┬аInstrument тАФ Represents the vertical component supported by the standards
The standards serve as the main support structure for the telescope, allowing it to rotate in the vertical plane (transiting) ┬╖ By being fixed to the upper plate, the entire vertical assembly maintains a constant orientation relative to the horizontal plate, ensuring that horizontal angle measurements remain precise while the telescope is moved.
Standards support the trunnion axis and the telescope.
They are 'A' shaped to provide structural rigidity and stability.
The upper plate contains the verniers or micrometers for reading the horizontal circle.
Rotation of the upper plate allows for horizontal angle measurement.
Provides stable support for the vertical rotation of the telescope.
Ensures alignment between the vertical axis and the horizontal circle.
The weight of the standards increases the total mass of the alidade.
Requires high precision manufacturing to prevent errors in horizontal measurements.
Measurement of horizontal and vertical angles.
Traversing and triangulation surveys.
Setting out curves and alignments in construction.
The lower plate (or graduated plate) is fixed to the leveling head and carries the horizontal circle.
The upper plate carries the telescope and the index marks; it moves relative to the lower plate.
Option B is incorrect because the lower plate is the base plate that remains stationary relative to the leveling head when the upper motion is used.
A is correct тАФ The two standards, resembling the letter 'A', are mounted on the upper plate of the theodolite to support the telescope and its rotation axis.
Always remember: The upper plate (alidade) carries the telescope and moving parts, while the lower plate carries the graduated horizontal circle.