Discussion
A surveyor's chain has stretched so that a nominal 20 m measures 20.1 m. Distances recorded with it will be
Answer: D
Correct answer: understated, and must be corrected upward
A stretched chain covers more ground per nominal length, so fewer chain lengths are counted over a given distance and the recorded figure is too small. The correction is to multiply by the ratio of true to nominal length, here 20.1/20, which increases the recorded distance by half a per cent. Using the chain consistently does not help, since every measurement is wrong by the same proportion.
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