Reduction Compasses

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Image: 8528_3202_1659-024.jpg | Nicolas Bion. ''Traité de la construction et des principaux usages des instruments de mathematique'', Paris, 1725, tav. 8.<br />
Image: 8528_3202_1659-024.jpg | Nicolas Bion. ''Traité de la construction et des principaux usages des instruments de mathematique'', Paris, 1725, tav. 8.<br />
   
   
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Image: 56696.jpg | Giacomo Contarini. ''Figure d'Istromenti Matematici'', Oxford, c. 1590 IN Filippo Camerota. ''Il compasso di Fabrizio Mordente: per la storia del compasso di proporzione''. Firenze, 2000, c21.<br />
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Image: 56696.jpg | Giacomo Contarini. ''Figure d'Istromenti Matematici'', Oxford, c. 1590, c21.<br />

Current revision as of 08:15, 10 September 2010

Name currently used for the compass with intersecting legs, or four-point compasses.


Contents

Historic Period

1st C. B.C.?


Description

Instrument used exclusively to reproduce drawings in reduced or enlarged scale, having two legs intersecting at a fixed or mobile centre whose opposed points form simple ratios of 1:2, 1:3 or other (Vocabolario della Crusca, 1878). The most ancient was found in the archaeological excavations of Pompeii. In the Renaissance it was known as double compasses, compasso a centro mobile (compass with mobile centre) (Giacomo Contarini) or compasso con le punte doppie (compass with double points) (Muzio Oddi, Fabbrica et uso del compasso polimetro, Milan 1633, Introduction), while in modern terminology it is also called four-point compasses.


Bibliographical Resources

Contarini, Giacomo. Figure d'Istromenti Matematici e loro uso, ms, ca. 1590, Oxford, Bodleian Library, Ms. Canon. Ital. 145, c. 21.

Oddi, Muzio. Fabbrica et uso del compasso polimetro, Milano 1633.


Existing Instruments

- Museo Galileo, Istituto e museo di storia della scienza, Firenze
Florence, Museo Galileo. Institute and Museum of the History of Science, Inv. 3686.
Florence, Museo Galileo. Institute and Museum of the History of Science, Inv. 655.
Florence, Museo Galileo. Institute and Museum of the History of Science, Inv. 633.


- Musée des arts et métiers, Paris
Paris, Musée des arts et metiers, inv. 02755-0000-
Paris, Musée des arts et metiers, inv. 08851-0000-
Paris, Musée des arts et metiers, inv. 02773-0000-


Napoli, Museo Archeologico Nazionale, Inv. 76684


Links (External)

http://www.informaworld.com/smpp/content~db=all~content=a756424205~frm=titlelink (English)


Images


Author of the entry: Filippo Camerota

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