Computer · Surveying
For the measurement of vertical angles using a transit theodolite, the instrument should be levelled with reference to the ________ bubble, and the ________ clamp is used to control the rotation of the telescope in the vertical plane.
- 1altitude; upper plate
- 2altitude; vertical circle✓
- 3foot-screw; lower plate
- 4spindle; vertical plate
Correct answer
altitude; vertical circle
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