Surveying
The length of a chain is measured from

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

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Surveying
The prismatic compass and surveyor’s compass

both give QB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give QB of a line and WCB of a line
both give WCB of a line

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