Meridian Pointer

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{{Template invention
{{Template invention
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|nome= Non ha un nome specifico.
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|nome= Has no specific name.
|inventore= Fabrizio Mordente?
|inventore= Fabrizio Mordente?
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|data= ca. 1570
|data= ca. 1570
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|descrizione= Giacomo Contarini lo descrive tra le invenzioni di Fabrizio Mordente come un "Inst[rument]o p[er] trovar il meridiano in ogni hora del giorno senza calamita". Lo strumento è formato da un disco orizzontale sul quale ruota una diottra che porta una tavoletta triangolare munita di arco zodiacale e ostensore. L'ostensore viene posizionato sul segno corrispondente al momento della misurazione e quando il sole passa attraverso i fori dei traguardi, un punto luminoso cade sulla diottra indicando la posizione del meridiano. Lo strumento serviva a costruire gli orologi solari.
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|descrizione= 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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<gallery widths=230 heights=368 perrow=3>
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Image: 56703.jpg| Giacomo Contarini. ''Figure d'Istromenti Matematici e loro uso'', ms, c. 1590, Oxford, c19.<br />
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|autore_scheda= Filippo Camerota
|autore_scheda= Filippo Camerota

Current revision as of 08:23, 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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