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Which is the most precise instrument designed for the measurement of horizontal and vertical angles?
Chain
Dumpy level
Theodolite
Telescope
Theodolite
A Theodolite is a precision optical instrument used for measuring both horizontal and vertical angles in surveying ┬╖ It consists of a telescope mounted on a base with graduated horizontal and vertical circles, allowing for high-accuracy angular readings through verniers or micrometers.
A Theodolite is a precision optical instrument used for measuring both horizontal and vertical angles in surveying ┬╖ It consists of a telescope mounted on a base with graduated horizontal and vertical circles, allowing for high-accuracy angular readings through verniers or micrometers.
╬╕=╬ФCircle┬аReading тАФ Angular measurement derivation
The principle of theodolite operation relies on the rotation of the telescope around two perpendicular axes (vertical and horizontal) ┬╖ By aligning the cross-hairs of the telescope with two distinct points and measuring the rotation on the horizontal and vertical graduated circular scales, the precise angle between those points is determined using the difference in readings.
Most versatile and precise instrument in conventional surveying.
Can measure horizontal angles to an accuracy of 1 to 20 seconds depending on the model.
Essential for triangulation, traversing, and layout of civil engineering structures.
High degree of precision in angular measurement.
Capability to measure both vertical and horizontal angles simultaneously.
Useful for determining elevations and heights when combined with leveling methods.
Requires skilled operator for precise handling.
Instrument is expensive and sensitive to environmental conditions.
Requires frequent temporary and permanent adjustments.
Triangulation surveys for geodetic networks.
Setting out curves and alignments for highways and railways.
Precise structural alignment in high-rise buildings.
The Dumpy Level (Option B) is primarily used for leveling (difference in elevation) but cannot measure horizontal angles.
The Chain (Option A) is a linear measurement tool, not an angular one.
A telescope is a component of a theodolite, not the measurement instrument itself.
C is correct тАФ A theodolite is the standard instrument specifically designed for the accurate measurement of both horizontal and vertical angles.
Always remember: if you need to find height differences, use a Level; if you need to find angles, use a Theodolite; for modern high-speed surveying, use a Total Station.