resection radiation traversing intersection

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the points are inaccessible it is not possible to measure any distance the points are too far and invisible the lengths are too short

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the station outside the great circle the station on the great circle the station within the great triangle The station within the great circle but outside the great triangle

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distances are short and accessible distances are short but inaccessible distances are long but accessible distances are long and inaccessible

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the line parallel to the bubble tube axis the geometrical axis of the telescope is the same as line of sight the line joining point of intersection of cross hairs and optical centre of object glass

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both straight lines same for smaller lengths the same for longer distances never the same

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a line parallel to a vertical line a line perpendicular to level line a vertical line a line perpendicular to the horizontal line

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curvature and refraction error collimation, curvature and refraction error collimation and curvature error fully and refraction error partly. collimation error

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are uniformly spaced close somewhere cross each other end abruptly

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reading right and left faces reading both the verniers taking both right swing and left swing readings reading different parts of main scale

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