If W is the weight of the chain, L is the span and P is the tension or pull, then the sag correction of chain line will be:

1
\(\frac {W^2L^2}{24P}\)
2
\(\frac {W^2L}{24P^2}\)
3
\(\frac {W^2L}{24P}\)
4
\(\frac {W^2L^2}{24P^2}\)

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