Question

The quadrantal bearing of a line is directly observed by:

• A. Prismatic compass
• B. Surveyor's compass
• C. Celestial observations
• D. Magnetic declination

Hint:

Remember: Prismatic Compass $\to$ Whole Circle Bearings, Surveyor's Compass $\to$ Quadrantal Bearings.

Answer 1

The Correct Option is B

Step 1: Define Quadrantal Bearing System.
Quadrantal bearings, or reduced bearings, are measured from the North or South direction towards the East or West, ranging from $0^\circ$ to $90^\circ$.

Step 2: Identify Observation Instrument.
The Surveyor's Compass is specifically designed to measure quadrantal bearings directly. Conversely, the Prismatic Compass measures whole-circle bearings.

Step 3: Evaluate Options.
- (A) Prismatic compass: Measures whole circle bearings, not quadrantal bearings.
- (B) Surveyor's compass: Directly provides quadrantal bearings.
- (C) Celestial observations: Used for astronomical bearings, not quadrantal bearings.
- (D) Magnetic declination: This is a correction factor, not an observation method.

Step 4: State Conclusion.
A Surveyor's Compass is used for direct observation of quadrantal bearings.