Meridian Pointer
From Inventions
| Line 23: | Line 23: | ||
<gallery widths=230 heights=368 perrow=3> | <gallery widths=230 heights=368 perrow=3> | ||
| - | Image: 56703.jpg| Filippo Camerota. ''Il compasso di Fabrizio Mordente: per la storia del compasso di proporzione''. Firenze, 2000, c19.<br /> | + | Image: 56703.jpg| Giacomo Contarini. ''Figure d'Istromenti Matematici e loro uso'', ms, c. 1590, Oxford IN Filippo Camerota. ''Il compasso di Fabrizio Mordente: per la storia del compasso di proporzione''. Firenze, 2000, c19.<br /> |
</gallery> | </gallery> | ||
Revision as of 08:01, 10 September 2010
Has no specific name.
Contents |
Inventor
Fabrizio Mordente?
Historic Period
ca. 1570
Description
Giacomo Contarini describes it among the inventions of Fabrizio Mordente as an "Inst[rument] f[or] finding the meridian at any time of day without a magnet". The instrument consists of a horizontal disk on which rotates a diopter carrying a triangular plate with a zodiacal belt and an index. The index is positioned at the sign marking the moment of measurement; when the sun's ray passes through the openings in the sights, a lighted dot falls on the diopter, indicating the position of the meridian. The instrument was used to construct sundials.
Bibliographical Resources
Contarini,Giacomo. Figure d'Istromenti Matematici e loro uso, ms, ca. 1590, Oxford, Bodleian Library, Ms. Canon. Ital. 145, c. 19.
Images
 Giacomo Contarini. Figure d'Istromenti Matematici e loro uso, ms, c. 1590, Oxford IN Filippo Camerota. Il compasso di Fabrizio Mordente: per la storia del compasso di proporzione. Firenze, 2000, c19. |
Author of the entry: Filippo Camerota
