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The vertical axis of a theodolite is the line passing through the centre of the instrument and extending vertically from the ground. It is usually aligned with the zenith, or north–south direction, and used to measure vertical angles in survey and engineering work.
The vertical axis of a theodolite is the line passing through the centre of the instrument and extending vertically from the ground. It is usually aligned with the zenith, or north–south direction, and used to measure vertical angles in survey and engineering work.
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