Fudicial Edge of Alidade is Provided

Answer: B. To draw a straight line

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

Solution

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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