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Question

Difficulty: MediumElementary Surveying Instruments and Fieldwork

Match each elementary surveying accessory or instrument on the left with its precise operational function during field survey procedures on the right.

  • Optical squareSetting out precise right-angled (90∘90^\circ) offsets from a baseline to detail points
  • Plumb bobCentering surveying equipment accurately over a ground station peg
  • ClinometerMeasuring vertical slope angles of terrain to determine slope distance corrections
  • Trough compassOrienting a plane table along the magnetic meridian during field mapping

Answer

Optical square matches setting out 90∘90^\circ offsets; Plumb bob matches centering equipment over ground pegs; Clinometer matches measuring vertical slope angles; Trough compass matches orienting a plane table to magnetic north.
Each instrument serves a distinct purpose in fieldwork setup and measurement: the optical square sets out 90∘90^\circ offsets; the plumb bob ensures precise vertical centering over ground pegs; the clinometer measures vertical slope angles for distance corrections; and the trough compass aligns plane tables to magnetic north.

Step-by-Step Solution

1
Identify the primary function of the optical square
Optical squares utilize double-reflection optics to construct perpendicular lines (90∘90^\circ offsets) relative to a baseline.
It ensures offset distances measured to nearby features are exactly perpendicular to the main survey line.
2
Identify the primary function of the plumb bob
Plumb bobs suspend vertically under gravity to align an overhead instrument center with a peg on the ground.
Accurate centering eliminates index and displacement errors at station points.
3
Identify the primary function of the clinometer
Clinometers measure vertical slope inclination angles.
Knowing slope angles allows conversion of surface distances measured along slopes into true horizontal ground distances.
4
Identify the primary function of the trough compass
Trough compasses align the board edges of plane tables parallel to the magnetic north magnetic meridian.
Proper orientation ensures consistent directional accuracy across all station setups in plane table surveying.

Key Concept

Fieldwork functions of elementary surveying tools and accessories
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Topics

Elementary Surveying Instruments and Fieldwork

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