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fore-staff
† ˈfore-staff Naut. Obs. [f. fore- prefix + staff.] = cross-staff 2 (see quot. 1867).1669 Sturmy Mariner's Mag. ii. 82 Thus I have shewed you how to take an Observation by the Fore-Staff. 1719 Halley in Phil. Trans. XXX. 993 The Moon was not too high to be well observed with a Forestaff. 1769 Falcon...
Oxford English Dictionary
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Cross-Staff - Ages of Exploration - Mariners' Museum and Park
The cross-staff was a navigational tool used to measure the angle between the horizon and a celestial body such as the sun or stars. By knowing this angle, a navigator could then determine his latitude and direction. The cross-staff is also referred to as the fore-staff and the Jacob's staff. Thomas Hood suggested that the name Jacob's ...
exploration.marinersmuseum.org
Jacob's staff - Wikipedia
Jacob's staff in the Museo Galileo, Florence Measuring the height of a star with a Jacob's staff. 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 ...
en.wikipedia.org
Jacob's staff
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.
wikipedia.org
en.wikipedia.org
staff
▪ I. staff, n.1 (stɑːf, -æ-) Pl. staves (steɪvz), staffs (stɑːfs, -æ-). Forms: 1 stæb, (stab-, steb-), 1–2 stef, 1–4 stæf, 1–6 staf, 3 oblique stæve, steave, 3–4 oblique stave, 4–7 stafe, 4–8, (9 arch.) staffe, 5–6 Sc. staif, 6 stayffe, Sc. stalf, (stafte), 4–7 gen. sing. staves, 3– staff; pl. 1 sta...
Oxford English Dictionary
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