Surveying Instrument by Grazia de' Castellani
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|data= c. 1400 | |data= c. 1400 | ||
| - | |descrizione= Described by the Abachist and Augustinian monk Grazia de' Castellani, the instrument is composed of two vertical perches (poles) 3 ''braccia'' high attached at right angles to a horizontal perch 4 braccia long. The perch facing the observer bears a sight, while the opposite one has several holes or other reference points to mark the intersection point of the visual ray. The instrument operates like the [[vertical verge]], the [[geometric quadrant]], and the [[board]] of D. da Chivasso. | + | |descrizione= Described by the Abachist and Augustinian monk Grazia de' Castellani, the instrument is composed of two vertical perches (poles) 3 ''braccia'' high attached at right angles to a horizontal perch 4 braccia long. The perch facing the observer bears a sight, while the opposite one has several holes or other reference points to mark the intersection point of the visual ray. The instrument operates like the [[vertical verge]], the [[Geometrical Square |geometric quadrant]], and the [[board]] of D. da Chivasso. |
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Current revision as of 11:45, 27 July 2010
Has no specific name
Contents |
Inventor
Grazia de’Castellani
Historic Period
c. 1400
Description
Described by the Abachist and Augustinian monk Grazia de' Castellani, the instrument is composed of two vertical perches (poles) 3 braccia high attached at right angles to a horizontal perch 4 braccia long. The perch facing the observer bears a sight, while the opposite one has several holes or other reference points to mark the intersection point of the visual ray. The instrument operates like the vertical verge, the geometric quadrant, and the board of D. da Chivasso.
Bibliographical Resources
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.
Domenico da Chivasso. Practica geometriae, Firenze, Biblioteca Mediceo Laurenziana, San Marco 215.
Images
 Ricostruzione dello strumento di Grazia de' Castellani e sua esemplificazione nel Tractato d'abbacho di Pier Maria Calandri, ms., sec. XV, Firenze, Biblioteca Medicea Laurenziana, Ashb. 359, cc. 205v-206r. |
Author of the entry: Filippo Camerota
