Dumpy level

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Question

This question was previously asked in

BPSC AE Paper 4 (General Engineering Science) 10 Nov 2022 Official Paper

Answer 1

Concept:

Dumpy Level:

A dumpy level is an optical instrument used in surveying to establish horizontal lines of sight. It is mainly used for measuring height differences and transferring, measuring, and setting horizontal levels.
It consists of a telescope firmly fixed to its support, allowing only horizontal rotation. This design ensures accuracy and stability, which is why dumpy levels are widely used in construction and civil engineering projects.

Features of a Dumpy Level:

Horizontal Rotation: The telescope of a dumpy level can rotate 360 degrees in the horizontal plane. This allows surveyors to sight and measure multiple points around the instrument while keeping the line of sight level.
No Vertical Rotation: The telescope is fixed vertically, meaning it cannot rotate up or down. This ensures that all measurements taken are along the same horizontal plane.
Leveling Bubble: A bubble level is used to ensure the instrument is level before taking measurements. The bubble helps maintain accuracy by confirming the instrument's stability and leveling.