Cross″–staff′ (–st?f′), n. 1. An instrument formerly used at sea for taking the altitudes of celestial bodies.
2. A surveyor's instrument for measuring offsets.
Webster's Dictionary 1913
Cross″–staff′ (–st?f′), n. 1. An instrument formerly used at sea for taking the altitudes of celestial bodies.
2. A surveyor's instrument for measuring offsets.