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cross-staff

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1
Jacob's staff - Wikipedia
Jacob's staff is a measuring tool with several variations. It is also known as cross-staff, a ballastella, a fore-staff, a ballestilla, or a balestilha. en.wikipedia.org
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Cross-Staff - Ages of Exploration
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. exploration.marinersmuseum.org
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The Cross Staff - PWG Home - NASA
Astronomers used the cross-staff for measuring the angle between the directions of two stars. Other, older instruments for this purpose existed ... pwg.gsfc.nasa.gov
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cross-staff
ˈcross-staff Also (in sense 1) 6 croystaff. † 1. Eccl. An archbishop's cross; also, by confusion, used for crose-staff, a bishop's crook or crosier. Obs. exc. Hist.1460 J. Capgrave Chron. (1858) 156 He [Rob{supt} Grostede] appered to the Pope, and smet him on the side with the pike of his crosse sta... Oxford English Dictionary
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CROSS-STAFF Definition & Meaning - Merriam-Webster
The meaning of CROSS-STAFF is an instrument formerly used at sea for taking the altitude of a celestial body. www.merriam-webster.com
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[PDF] ANCIENT TECHNOLOGY THE CROSS STAFF tan a = BC/AC
In the ancient world, a cross-staff was a tool used for both astronomy and navigation, in order to measure the angle between celestial bodies, such as stars. lacountylibrary.org
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ION Museum: Cross-staff
To use the cross-staff the navigator selected the vane most appropriate for the angle that needed to be measured and slipped it over the staff. The staff was ... www.ion.org
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Epact: Scientific Instruments of Medieval and Renaissance Europe
The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes ... www.mhs.ox.ac.uk
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paselkr1 - Cross Staff - Google Sites
The cross-staff (also known as the baculus or Jacob's Staff) was one of the earliest navigation instruments devised by Henry the Navigator's school of ... sites.google.com
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cross-staff - Wiktionary, the free dictionary
Noun · (ecclesiastical, obsolete) An archbishop's cross. · (historical) An early instrument, consisting of a wooden rod with a sliding crosspiece, used for ... en.wiktionary.org
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Cross-staff | measurement instrument - Britannica
a simple device consisting of a staff about 3 feet (1 metre) long fitted with a sliding crosspiece (see photograph). www.britannica.com
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Backstaff
Cross-staff The cross-staff was normally a direct observation instrument. However, in later years it was modified for use with back observations. Thomas Hood cross-staff Thomas Hood invented this cross-staff in 1590. It could be used for surveying, astronomy or other geometric problems. wikipedia.org
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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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New Holy Cross football coach Dan Curran is excited about recruits, staff
3 days agoThe 47-year-old Curran spent the last 11 years as the coach at Merrimack, where he previously served as offensive coordinator. Curran is Merrimack's all-time winningest coach, and he ushered the ...
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Lahr (Hunsrück)
The municipality's arms might in English heraldic language be described thus: Gules in dexter base a plough argent and in chief sinister a cross-staff The other charges, the cross-staff and the ear, are Saint Oranna's attributes, thus representing the church's patron saint. wikipedia.org
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