Discussion :: Surveying - Section 1 (Q.No.28)
|Neeraj said: (Apr 28, 2018)|
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.
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.
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.
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)|
|Chitra said: (Mar 28, 2019)|
|Asad said: (Feb 17, 2020)|
|Excellent explanation@ Thanks Neeraj.|
|Siddhi Mahtre said: (Mar 10, 2021)|
|Nice. Thanks all.|
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