Surveying
The length of a chain is measured from

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

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy
angular measurements are more accurate than linear measurements
All of these

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