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Webster's 1828 Dictionary

CROSS-STAFF

n.An instrument to take the altitude of the sun or stars.

 

Webster's 1913 Dictionary

CROSS-STAFF

CROSS-STAFF Cross "-staff ` (-stf `), n.

 

1. An instrument formerly used at sea for taking the altitudes of celestial bodies.

 

2. A surveyor's instrument for measuring offsets.