Surveying
The length of a chain is measured from

inside of one handle to inside of other handle
outside of one handle to inside of other handle
centre of one handle to centre of other handle
outside of one handle to outside of other handle

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Surveying
The necessary geometrical condition for triangulation adjustment is:

All listed here
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the angles around a station should be 360°
The sum of the three angles of a plane triangle should be 180°

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Surveying
Refraction correction

partially eliminates curvature correction
has no effect on curvature correction
adds to the curvature correction
completely eliminates curvature correction

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