Drawing Instrument for Sundials

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Image: Libro Mordente.jpg | Giacomo Contarini,''Figure d'Istromenti Matematici'', ms, ca. 1590, Oxford, Bodleian Library, Ms. Canon. Ital. 145, cc. 29-29.<br />
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Image: 56711.jpg | Giacomo Contarini. ''Figure d'Istromenti Matematici'', Oxford, c. 1590, cc28-29.<br />
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|autore_scheda= Filippo Camerota
|autore_scheda= Filippo Camerota

Current revision as of 08:33, 10 September 2010

Has no specific name.

Contents

Inventor

Fabrizio Mordente?


Historic Period

XVI century


Description

Instrument illustrated by Giacomo Contarini as one of Fabrizio Mordente’s inventions. Although there is no text to explain its operation, it was probably designed for drawing sundials. On a horizontal half-disk is a dial carrying a compass and a long rod on which slides a graduated disk with a diagram of the zodiacal arc. The user fixed the horizontal half-disk to a table, and, establishing a fixed reference point (the façade of a building, for example), rotated the dial in the direction of the local meridian, inclining the rod according to the latitude of the place and fixing the zodiacal disc in relation to the desired size of the drawing. By means of a string, the zodiacal signs were then projected onto the horizontal sheet of flat paper.


Bibliographical Resources

Contarini,Giacomo, Figure d'Istromenti Matematici e loro uso, ms, ca. 1590, Oxford, Bodleian Library, Ms. Canon. Ital. 145, cc. 28-29.



Images


Author of the entry: Filippo Camerota

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