"Gran Regola" (Great-Rule) of Ptolemy
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| - | |nome= | + | |nome= Name used in Renaissance times to indicate Ptolemy's [[triquetrum]]. |
|inventore= Claudio Tolomeo | |inventore= Claudio Tolomeo | ||
| - | |data= | + | |data= 2nd C. A.D. |
| - | |descrizione= | + | |descrizione= Instrument for astronomical and terrestrial measurements, also called triquetrum, whose invention is attributed to Claudius Ptolemy (middle of the 2nd century C.E.). According to the description given by Antonio Santucci (? - 1613) in his manuscript ''Trattato di diversi instrumenti matematici'' (1593), the instrument is composed of two pivoting rods, like compasses, divided lengthwise into 100 parts and fitted with a protractor at the hinge. A third rod pivots at the end of one of the main rods. Its length is equal to the diagonal of the square constructed from the two main rods, and it is thus divided into 141 and 2/5ths parts. It serves as the base of the triangle formed by the three elements. The instrument is used to measure the height of the Sun on the horizon, the distances between celestial bodies, and terrestrial distances, as well as for surveying. In the latter application, and because of its structure, it may be regarded as the prototype of the ''archimetro fiorentino''. |
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|autore_scheda= Filippo Camerota | |autore_scheda= Filippo Camerota | ||
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Current revision as of 09:52, 26 July 2010
Name used in Renaissance times to indicate Ptolemy's triquetrum.
Contents |
Inventor
Claudio Tolomeo
Historic Period
2nd C. A.D.
Description
Instrument for astronomical and terrestrial measurements, also called triquetrum, whose invention is attributed to Claudius Ptolemy (middle of the 2nd century C.E.). According to the description given by Antonio Santucci (? - 1613) in his manuscript Trattato di diversi instrumenti matematici (1593), the instrument is composed of two pivoting rods, like compasses, divided lengthwise into 100 parts and fitted with a protractor at the hinge. A third rod pivots at the end of one of the main rods. Its length is equal to the diagonal of the square constructed from the two main rods, and it is thus divided into 141 and 2/5ths parts. It serves as the base of the triangle formed by the three elements. The instrument is used to measure the height of the Sun on the horizon, the distances between celestial bodies, and terrestrial distances, as well as for surveying. In the latter application, and because of its structure, it may be regarded as the prototype of the archimetro fiorentino.
Bibliographical Resources
Santucci, Antonio. Trattato di diversi Istrumenti Matematici che si conservano al presente nella Guardaroba del Gran Duca di Toschana. Presi in disegno in questo libro, con le loro operazioni. Come in misurare le lunghezze, larghezze, altezze, overo profondità; così delle cose terrene come Celesti; Similmente in levar le piante delle Provincie o di qual si voglia cosa con ogni particolarità che giustamente stien ne' luoghi loro, ms., Firenze, Bibl. Marucelliana, Ms. C 82.
Images
 Egnazio Danti. Primo volume dell'vso et fabbrica dell'astrolabio et del planisferio / di maestro Egnatio Danti ... ; nuouamente ristampato et accresciuto in molti luoghi con l'aggiunta dell'vso & fabbrica di noue altri istromenti astronomici. Firenze, 1578, p.244 |
 Antonio Santucci. Trattato di diuersi istrumenti matematici che si conseruano al presente nella Guardaroba del Gran Duca di Toschana presi in disegno in questo libbro, con le loro operazioni come in misurare le lunghezze, largezze, altezze ouero profondita, così delle cose terrene come celesti, similmente in leuar le piante delle prouincie o di qual si voglia cosa con ogni particolarità che giustamente stien ne luoghi loro, ms., 1593, Firenze, Biblioteca Marucelliana, C 82, c. 44v. |
 Willem Janszoon Blaeu. Le grand atlas, ou, Cosmographie Blaviane, en laquelle est exactement descripte la Terre, la mer et le ciel. Amsterdam, 1667, tavola. |
 Giovanni Paolo Gallucci. Della fabrica et uso di diuersi stromenti di astronomia et cosmografia : oue si uede la somma della teorica et pratica di queste due nobilissime scienze, Venezia, 1598, p.219v. |
Author of the entry: Filippo Camerota
