If 'W' is the weight of the chain, 'L' is the span and 'P' is the tension, the sag correction for a chain line would be
1
\(\rm\frac{W^2 L^2}{24 P^2}\)
2
\(\rm\frac{W^2 L}{24 P^2}\)
3
\(\rm\frac{W L}{24 P}\)
4
\(\rm\frac{W L}{24 P^2}\)
5
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