Meridian Pointer

From Inventions

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-	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, c19.<br />
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Current revision as of 08:23, 10 September 2010

Has no specific name.

Contents 1 Inventor 2 Historic Period 3 Description 4 Bibliographical Resources 5 Images

Inventor

Fabrizio Mordente?

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Historic Period

ca. 1570

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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.

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Bibliographical Resources

Contarini,Giacomo. Figure d'Istromenti Matematici e loro uso, ms, ca. 1590, Oxford, Bodleian Library, Ms. Canon. Ital. 145, c. 19.

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Images

Giacomo Contarini. Figure d'Istromenti Matematici e loro uso, ms, c. 1590, Oxford, c19.

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Author of the entry: Filippo Camerota