Quadrant

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Name adopted since the Middle Ages (in latino quadrans = one fourth) with reference to the instrument's quarter-circle shape.

Contents

Inventor

Anonimo arabo


Historic Period

X-XI sec.?


Description

Instrument used for astronomical and terrestrial measurements. Derived from the astrolabe, the quadrant generally has a quarter-circle shape. Along its circumference are various concentric arcs bearing the degree scale, the calendar and the zodiac. The unequal hour lines and the shadow square are engraved at the centre. The sights for measurement are mounted on one of the straight sides. At the angle formed by these sides hangs a plumb bob for reading the inclination of the view. The quadrant's surveying operations have been described since the Middle Ages.


Bibliographical Resources

Fibonacci, Leonardo La Pratica di Geometria. Volgarizzata da Cristofano di Gherardo di Dino cittadino Pisano,dal codice 2186 della Biblioteca Riccardiana di Firenze, a cura e con introduzione di Gino Arrighi. Pisa, Domus Galileiana, 1966, VII, p. 204.
Robertus Anglicus. Tractatus quadrantis, in Tannery, Paul. Sciences exactes au Moyen Age, in Memoires scientifiques. Toulouse, E. Privat, 1922, pp. 150-189.
Castellani, Grazia de’. Chasi sopra chompagnie: dal codice Palatino 573 della Biblioteca nazionale di Firenze. A cura e con introduzione di Marisa Pancanti. Siena, Servizio editoriale dell'università, 1984, 2.
Anonimo fiorentino. Trattato di geometria pratica, dal codice L.IV.18 (sec. XV) della Biblioteca comunale di Siena. A cura e con introduzione di Annalisa Simi. Siena, Università degli studi, 1993, c. 76v.
Anonimo senese (sec. XV). Differenze di geometria e misure a ochio: dal ms. Plimpton 194 della Biblioteca della Columbia University. A cura e con introduzione di Maria Teresa Rivolo. Siena, Università degli studi di Siena, 1985.
Francesco di Giorgio Martini. La pratica di geometria: dal codice Ashburnham 361 della Biblioteca Medicea Laurenziana di Firenze. A cura di Gino Arrighi. Firenze, Giunti, 1970, cc. 28r-v.
Boffito, Giuseppe. Gli strumenti della scienza e la scienza degli strumenti: con l'illustrazione della Tribuna di Galileo. Facsimili di Primo Benaglia. Firenze, Libr. internazionale Seeber, 1929.
Turner, Anthony. Early scientific instruments: Europe 1400-1800. London, Sotheby, 1987.
Kiely, Edmond R. Surveying instruments: their history. Columbus, Carben surveying reprints, 1979.
Medieval mensuration: Quadrans vetus and Geometrie due sunt partes principales. Edited by Nan L. Hahn. Philadelphia, The American philosophical society, 1982.
Jode, Cornelis. De quadrante geometrico libellus: in quo quidquid ad linearum et superficierum, utpote altitudinum et latitudinum, dimensiones facit lucidissime demonstratur, additae figurae aeneae 37. ad maiorem doctrinae intelligentiam et lucem hactenus non ita expositae. Noribergae, sumptibus et expensis Cornelii de Iudaeis editus, typis Christophori Lochneri, 1594.
Hultius, Levinus. Theoria et praxis quadrantis geometrici... das ist, Beschreibung, Unterricht und Gebrauch des gevierdten geometrischen und anderer Instrument. Noribergae, Typis Gerlachianis, sumptibus Cornelii de Iudaeis, 1594.


Existing Instruments

Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 662.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2513.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2513.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2518.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2465.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 3365.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2509.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2522.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2523.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 245.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2524.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2520.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2525.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2521.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 3628.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 239.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2599.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 3822.
Florence, Museo Galileo. Institute and Museum of the History of Science, inv. 2544, 3187.


Links (External)

http://masaccio:81/catalogue.museogalileo.it/indepth/Quadrant.html


Images


Author of the entry: Filippo Camerota

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