To measure vertical angles, the theodolite must be levelled with reference to ________.

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SSC JE Civil 11 Oct 2023 Shift 1 Official Paper - 1
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  1. the altitude bubble on the index frame
  2. the altitude bubble on the telescope
  3. the bubble tube on the plate level
  4. the altitude bubble on both the telescope and the index frame

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Option 1 : the altitude bubble on the index frame
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Theodolite

  • It is a measurement instrument reutilizing in surveying to determine horizontal and vertical angles with the ting low telescope that may move within the horizontal and vertical planes.
  • For the measurement of vertical angles through a theodolite, the instrument should be leveled with reference to the Altitude bubble on the index frame and the vertical circle clamp that is used to rotate the telescope in the vertical plane.
  • Transiting or plunging is the process of rotating the theodolite along its horizontal axis in a vertical plane.
  • The lower plate of theodolite is known as the scale plate. It carries a horizontal circle at its beveled edge.
  • Least count is the smallest value that can be measured by a theodolite, least count of theodolites are generally 20” and 15” and so on.
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