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Horizontal axis is also called _______.
Vertical Axis
Outer Axis
Trunnion Axis
Line of sight
Trunnion Axis
In a theodolite, the horizontal axis is the axis about which the telescope rotates in the vertical plane ┬╖ It is technically referred to as the trunnion axis because the telescope is supported by trunnions resting on the standards of the instrument.
In a theodolite, the horizontal axis is the axis about which the telescope rotates in the vertical plane ┬╖ It is technically referred to as the trunnion axis because the telescope is supported by trunnions resting on the standards of the instrument.
e=VтИТ(H┬▒╬╕) тАФ represents the error due to non-perpendicularity of the trunnion axis to the vertical axis, where e is the error, V is the vertical angle, and H is the horizontal axis inclination.
The trunnion axis allows the telescope to perform 'transiting' or 'plunging'. It must be perfectly perpendicular to the vertical axis of the theodolite to ensure accurate vertical angle measurements and to prevent collimation errors during telescope rotation.
The horizontal axis is also known as the trunnion axis.
It must be perpendicular to the vertical axis for precise measurements.
Adjustments to this axis are performed to eliminate 'horizontal axis error'.
It is the axis about which the telescope moves when measuring vertical angles.
Allows for full rotation of the telescope (transiting).
Essential for defining the vertical plane in geodetic surveying.
Susceptible to mechanical wear leading to instrument error.
Requires periodic calibration to maintain perpendicularity with the vertical axis.
Measuring vertical angles in topography.
Controlling vertical alignment in civil engineering projects.
Determining heights and elevation differences via trigonometric leveling.
The Vertical axis is the axis about which the theodolite rotates in the horizontal plane.
The Line of Sight (Line of Collimation) is the line passing through the optical center of the object glass and the intersection of the crosshairs.
Option D (Line of sight) refers to the optical axis, not the mechanical support axis.
C is correct тАФ The horizontal axis is technically termed the trunnion axis as it supports the telescope on the standards.
Always remember that in surveying instruments, axes are defined by their physical rotation function; the horizontal axis rotates the telescope vertically, while the vertical axis rotates the whole head horizontally.