engineering recuitment JSSC JE Mock Test 2023 Surveying Compass Surveying and Theodolite

Which among the following is judged by using plumb-bob, and if it is NOT available, it may be judged by dropping a pebble from the center of the bottom of the instrument?

1

Levelling

2

Focusing the prism

3

Straightening

4

Centring

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