Surveying
If the length of a chain is found to be short on testing, it can be adjusted by

removing one or more small circular rings
All of these
straightening the links
closing the joints of the rings if opened out

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Surveying
The cross hairs in the surveying telescope are placed

anywhere between eye-piece and objective lens
much closer to the objective lens than to the eye piece
midway between eye piece and objec-tive lens
much closer to the eye-piece than to the objective lens

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