Fudicial Edge of Alidade is Provided

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Fiducial Edge of Alidade is provided-

  1. To measure right angle
  2. To draw a straight line
  3. To check the direction
  4. None of the above

Answer: B. To draw a straight line

The fiducial edge of alidade is provided to draw a straight line.


The instrument used for sighting a point while plane table surveying is known as an alidade. Alidade has two different edges.

  • Graduated Edge
  • Fiducial Edge

Fiducial Edge is kept Straight. Hence, a fiducial edge of alidade is provided for drawing a straight line.

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