Cross-staff

Cross´-staff`

n.	1.	An instrument formerly used at sea for taking the altitudes of celestial bodies.
	2.	A surveyor's instrument for measuring offsets.

cross-staff

[′krȯs ‚staf] (navigation) A forerunner of the modern sextant, used for measuring altitudes of celestial bodies, consisting essentially of a wooden rod with one or more perpendicular crosspieces free to slide along the main rod. Also known as forestaff; Jacob's staff.

ThesaurusSeeJacob's staff

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