Surveying
The line of collimation method of reduction of levels, does not provide a check on

Back sights
Fore sights
Intermediate sights
Reduced levels

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Surveying
The cross hairs in the surveying telescope are placed

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

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Surveying
The error due to eccentricity of inner and outer axes can be eliminated by

reading both verniers and taking the mean of the two
taking both face observations and taking the mean of the two
double sighting
taking mean of several readings distributed over different portions of the graduated circle

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