Meridian Pointer

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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 />
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|autore_scheda= Filippo Camerota
|autore_scheda= Filippo Camerota

Revision as of 07:51, 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


Author of the entry: Filippo Camerota

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