Bible Dictionaries
Cross-Staff
Webster's Dictionary
(1):
(n.) A surveyor's instrument for measuring offsets.
(2):
(n.) An instrument formerly used at sea for taking the altitudes of celestial bodies.
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Bibliography Information
Webster, Noah. Entry for 'Cross-Staff'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/c/cross-staff.html. 1828.