The 'rankin''s method' (offsets from long chord) for setting out a circular curve gives:
Choose the correct answer
Offsets from tangent to curve (tangent offset method)
Deflection angles from PC measured with theodolite + chord distances to each curve point
Coordinates computed independently (coordinate method)
Chaining along the arc (not chord)
Correct Answer
B. Deflection angles from PC measured with theodolite + chord distances to each curve point
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Rankine deflection angle method: angles from instrument at PC (point of curvature) with back bearing on tangent. Deflection angle δ = chord×180/(2πR) per chord length. Theodolite at PC; sight on back tangent; set deflection angle; measure chord → point on curve. Commonly used in field with theodolite and chain. Very accurate for long curves.
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