Setting out of a simple circular curve by 'linear' method (offset from long chord or chord produced) is used when:
Choose the correct answer
A very precise survey is required
A theodolite is not available and a tape/chain method is sufficient for setting out the curve
Curves are very long (> 500 m)
Only for spiral curves
Correct Answer
B. A theodolite is not available and a tape/chain method is sufficient for setting out the curve
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Linear methods for setting out curves: offset from long chord (Mx = √(R² − x²) − (R² − L²/4)^0.5); chord produced. Used when theodolite not available or short curves. Rankin''s deflection angle method (theodolite) is more accurate for long curves. Linear methods: surveyor''s tape + pegs; less precise but quick for small radius curves.
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