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O que (quem) é Jacob's staff - definição
Jacob's staff
![Nautical cross-staff dated 1776, on display at [[Musée national de la Marine]], Paris.](https://commons.wikimedia.org/wiki/Special:FilePath/Cross-staff-MnM 11 NA 5-IMG 5989-black.jpg?width=200 "Nautical cross-staff dated 1776, on display at [[Musée national de la Marine]], Paris.")
![A Jacob's staff, from [[John Seller]]s' ''Practical Navigation'' (1672)](https://commons.wikimedia.org/wiki/Special:FilePath/Jacobstaff.svg?width=200 "A Jacob's staff, from [[John Seller]]s' ''Practical Navigation'' (1672)")
CALIBRATED WOODEN ROD WITH SLIDING CROSSPIECE USED FOR MEASURING THE ALTITUDE OF CELESTIAL BODIES OR THE HEIGHT OF DISTANT OBJECTS
Jacob Staff; Jacob's Staff; Cross-staff; Cross staff; Cross head (surveying); Ballastella; Radius astronomicus
The term Jacob's staff is used to refer to several things, also known as cross-staff, a ballastella, a fore-staff, a ballestilla, or a balestilha. In its most basic form, a Jacob's staff is a stick or pole with length markings; most staffs are much more complicated than that, and usually contain a number of measurement and stabilization features.
Jacob's staff
CALIBRATED WOODEN ROD WITH SLIDING CROSSPIECE USED FOR MEASURING THE ALTITUDE OF CELESTIAL BODIES OR THE HEIGHT OF DISTANT OBJECTS
Jacob Staff; Jacob's Staff; Cross-staff; Cross staff; Cross head (surveying); Ballastella; Radius astronomicus
¦ noun a rod with a sliding cursor formerly used for measuring distances and heights.
Origin
C16 (denoting a pilgrim's staff): alluding to St James (Jacobus in eccles. L.), whose symbols are a pilgrim's staff and a scallop shell.
Cross-staff
CALIBRATED WOODEN ROD WITH SLIDING CROSSPIECE USED FOR MEASURING THE ALTITUDE OF CELESTIAL BODIES OR THE HEIGHT OF DISTANT OBJECTS
Jacob Staff; Jacob's Staff; Cross-staff; Cross staff; Cross head (surveying); Ballastella; Radius astronomicus
·noun A surveyor's instrument for measuring offsets.
II. Cross-staff ·noun An instrument formerly used at sea for taking the altitudes of celestial bodies.
