Question

1. State the purpose of differential levelling.​

Answer 1

used to determine the difference between the elevation of the two points situated remotely form each other.

Explanation:

The differential leveling is a technique used to determine the difference between the elevation of the two points situated remotely form each other.

This is carried out using an instrument called surveyor's level which is an optical device.

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TOPIC: surveyor's level

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Answer 2

Purpose of differential levelling:

• The differential levelling is used to find the vertical distance between two points that are faraway from each other.
• In this technique, one of the point is known and another is unknown.

Types of differential levelling:

• Automatic levels: This process uses gravity-referenced prism.
• Digital levels: This process uses electronic measurements.
• Optical-micrometer levels: This process uses plane parallel-plate lens.

Components used in differential levelling:

• A level
• A levelling head
• A tripod
• A level tube
• Rods
• A telescope