Civil Engineering - Surveying - Discussion

28. 

Pick up the correct statement from the following:

[A]. the theodolite in which telescope can be rotated in vertical plane is called a transit
[B]. when the vertical circle is to the left of the telescope during observation, it is called to be in left face
[C]. when the vertical circle is to the right of the telescope during observation, it is called to be in right face
[D]. all the above.

Answer: Option D

Explanation:

No answer description available for this question.

Neeraj said: (Apr 28, 2018)  
Transiting:

It is also known as plunging or reversing. It is the process of turning the telescope about its horizontal axis thought 180° in the vertical plane thus bringing it upside down and making it point exactly in opposite direction.

Swinging the Telescope:

It means turning the telescope about its vertical axis in the horizontal plane. A swing is called right or left according as the telescope is rotated clockwise or counterclockwise.

Face Left:

If the vertical circle of the instrument is on the left of the observer while taking a reading, the position is called the face left and the observation taken on the horizontal or the vertical circle in this position is known as the face left observation.

Face Right:

If the vertical circle of the instrument is on the right of the observer while taking a reading, the position is called the face light, and the observation taken on the horizontal or the vertical circle in this position is known as the face right observation.

Changing Face:

It is the operation of bringing the vertical circle to the right of the observer if originally it is to the left, and vice- versa. It is done in two steps: firstly revolve the telescope through 180° in a vertical plane and then rotate it through 180° in the horizontal plane i.e. first transit the telescope and then swing it through 180°.

Shubham said: (Jul 29, 2018)  
Good explanation, Thanks @Neeraj.

Paras Maskare said: (Aug 9, 2018)  
Thanks @Neeraj.

Chitra said: (Mar 28, 2019)  
Thanks @Neeraj.

Asad said: (Feb 17, 2020)  
Excellent explanation@ Thanks Neeraj.

Siddhi Mahtre said: (Mar 10, 2021)  
Nice. Thanks all.

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