Surveying
Subtense bar is an instrument used for

levelling
measurement of angles
measurement of horizontal distances in undulated areas
measurement of horizontal distances in plane areas

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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 WCB of a line
both give QB of a line and WCB of a line

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