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The index frame is ______ shaped frame.
U
V
T
A
T
In a survey theodolite, the index frame (also known as the T-frame or vernier frame) is a T-shaped component used to support the verniers for reading the vertical circle ┬╖ It is mounted on the horizontal axis of the theodolite and carries the verniers that remain stationary while the vertical circle rotates.
In a survey theodolite, the index frame (also known as the T-frame or vernier frame) is a T-shaped component used to support the verniers for reading the vertical circle ┬╖ It is mounted on the horizontal axis of the theodolite and carries the verniers that remain stationary while the vertical circle rotates.
╬▒=╬╕readingтАЛтИТ╬╕zeroтАЛ тАФ Calculation of vertical angle based on the index frame vernier reading
The index frame is attached to the horizontal axis of the telescope ┬╖ When the telescope is tilted for vertical angle measurements, the vertical circle rotates with the telescope while the index frame, held by the altitude bubble or a counterweight, remains fixed in a vertical plane, allowing the vernier to measure the rotation angle.
The index frame is an integral part of the vernier theodolite assembly.
It carries the vernier scales used for reading the vertical circle angles.
It must remain level or vertical, often assisted by an altitude bubble.
The T-shape provides structural stability for precise alignment.
Enables accurate vertical angle measurements.
Provides a stable platform for vernier scales.
Requires sensitive level adjustment.
Prone to mechanical wear in the pivot points.
Transit theodolite surveying.
Vertical angle determination in leveling and triangulation.
The frame is essentially a rigid support system that ensures the vernier index stays fixed relative to the gravity line.
Options A, B, and D describe shapes that lack the necessary mechanical stability and attachment points for vernier scales in standard theodolite design.
C is correct тАФ The index frame is a T-shaped component in a theodolite used to hold the verniers for reading vertical angles.
Always ensure the altitude bubble is centered before taking vertical circle readings, as the index frame relies on this to maintain its reference position.