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Difficulty: MediumElementary Surveying Instruments and Fieldwork

Match each elementary surveying instrument on the left with its correct fieldwork purpose on the right.

  • Abney LevelDetermining slope angles and vertical gradients in terrain profiling
  • Marking Pin (Arrow)Securing and tracking completed chain lengths on the ground during distance measurement
  • Ranging PoleEstablishing intermediate visual sight lines along a straight survey line
  • Offset RodMeasuring short right-angled distances from the main survey line to nearby features

Answer

Abney Level pairs with determining slope angles; Marking Pin pairs with tracking completed chain lengths; Ranging Pole pairs with establishing straight sight lines; Offset Rod pairs with measuring short right-angled distances.
Each instrument is correctly matched to its distinct functional role in chain and slope surveying: Abney Level for vertical angle/gradient measurement, Marking Pins for tracking chain counts, Ranging Poles for maintaining straight line-of-sight paths, and Offset Rods for lateral feature positioning.

Step-by-Step Solution

1
Identify instruments designed for angular/vertical measurements.
The Abney Level measures vertical angles and slope gradients, matching it to terrain profiling.
Abney levels integrate a spirit level with a protractor scale specifically for gradient work.
2
Differentiate linear marking tools from alignment tools.
Marking Pins (arrows) are pushed into the ground at chain ends to keep count, while Ranging Poles are held upright to establish straight lines between survey stations.
Chain surveying relies on arrows to avoid counting errors over long distances and poles for visual alignment over line-of-sight distances.
3
Identify specialized tools for lateral offsets.
The Offset Rod measures short perpendicular distances from the main survey line.
Offset rods allow surveyors to capture boundaries, trees, or building corners situated near the main chain line.

Key Concept

Elementary Surveying Instrument Functions
Estimated Time:1m 30s
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Topics

Elementary Surveying Instruments and Fieldwork

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