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
Homologous points are

Opposite corners of a photograph
Nodal points of the camera lens
Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs

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Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of both horizontal and vertical angles
measurement of vertical angles only

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