Pantometer

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|nome= Nome coniato dall'inventore (in latino "regula pantometra")
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Name coined by the inventor (in Latin regula pantometra)
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|descrizione= La "regula pantometra" è un [[compasso di proporzione]] a gambe piatte elaborato da Michel Coignet per l’arciduca Alberto, quindi forse già nel 1596. Lo strumento deriva chiaramente dalla seconda versione del [[compasso magistrale]] di Fabrizio Mordente (1572), senza però le fessure e i cursori. Nei due manoscritti noti del ''De regulae pantometrae fabrica et usu libri septem'', il compasso è illustrato soprattutto come strumento topografico, montato su un treppiede uguale a quello proposto per il compasso di Mordente nel trattato dedicato a ''L’uso del compasso di Fabritio Mordente Salernitano...'', Anversa 1608. Il compasso era anche dotato di una riga pieghevole simile a quella del compasso di Mordente, ed era munito di traguardi ottici che riproducevano fedelmente le punte fisse del suo modello di ispirazione. Le operazioni topografiche, inoltre, sono analoghe a quelle esposte nel trattato sul compasso di Mordente. A differenza di quest'ultimo, però, lo strumento di Coignet è dotato di altre scale proporzionali incise sulle gambe e destinate a svolgere più complesse operazioni trigonometriche: la scala delle divisioni in parti uguali, la scala delle corde e la scala dei seni.  
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The "regula pantometra" is a [[Proportional Compasses | proportional compasses]] with flat legs designed by Michel Coignet for Archduke Albert, perhaps as early as 1596. The instrument clearly derives from the second version of Fabrizio Mordente's [["Compasso Magistrale" (Masterly Compasses) | "compasso magistrale" (masterly compasses)]] o (1572), but without the slots and cursors. In the two known manuscripts  of ''De regulae pantometrae fabrica et usu libri septem'', the compass is described as essentially a surveying instrument, mounted on a tripod identical to the one proposed for Mordente's compass in the treatise on  ''L'uso del compasso di Fabritio Mordente Salernitano..''. [The operation of the compass of Fabrizio Mordente from Salerno…], Antwerp 1608. The compass also had a folding ruler like that of Mordente's compass, and was fitted with optical sights that faithfully reproduced the fixed points of the model it emulated. Moreover, its surveying operations resembled those described in the treatise on Mordente's compass. Unlike the latter, however, Coignet's instrument has other proportional scales engraved on the legs, used to perform more complex operations in trigonometry: the scale of division into equal parts, the scale of cords and the scale of sines.
|inventore= Michel Coignet
|inventore= Michel Coignet
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|immagini= <gallery widths=230 heights=368 perrow=3>
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Image: 56698.jpg | Coignet, Michel. ''De Regulae Pantometrae fabrica et usu libri septem'', ms., Oxford.<br />
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Image: File.jpg| Michel Coignet, ''De Regulae Pantometrae fabrica et usu libri septem'', ms., Oxford, Bodleian Library, Banon Misc. 243.<br />
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Image: 56699.jpg | Coignet, Michel. ''Usus duodecim divisionem regulae pantometrae'', ms. 1610-1613, Firenze.<br />
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Image: File.jpg| Michel Coignet, ''Usus duodecim divisionem regulae pantometrae'', ms. 1610-1613, Firenze, Biblioteca Riccardiana, 859.<br /><br />
 
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Current revision as of 08:16, 10 September 2010

Name coined by the inventor (in Latin regula pantometra)

Contents

Inventor

Michel Coignet

Historic Period

1596?

Description

The "regula pantometra" is a proportional compasses with flat legs designed by Michel Coignet for Archduke Albert, perhaps as early as 1596. The instrument clearly derives from the second version of Fabrizio Mordente's "compasso magistrale" (masterly compasses) o (1572), but without the slots and cursors. In the two known manuscripts of De regulae pantometrae fabrica et usu libri septem, the compass is described as essentially a surveying instrument, mounted on a tripod identical to the one proposed for Mordente's compass in the treatise on L'uso del compasso di Fabritio Mordente Salernitano... [The operation of the compass of Fabrizio Mordente from Salerno…], Antwerp 1608. The compass also had a folding ruler like that of Mordente's compass, and was fitted with optical sights that faithfully reproduced the fixed points of the model it emulated. Moreover, its surveying operations resembled those described in the treatise on Mordente's compass. Unlike the latter, however, Coignet's instrument has other proportional scales engraved on the legs, used to perform more complex operations in trigonometry: the scale of division into equal parts, the scale of cords and the scale of sines.

Bibliographical Resources

Coignet, Michel. De Regulae Pantometrae fabrica et usu libri septem, ms., Oxford, Bodleian Library, Banon Misc. 243.

Coignet, Michel. Usus duodecim divisionem regulae pantometrae, ms. 1610-1613, Firenze, Biblioteca Riccardiana, 859.

Coignet, Michel. El uso del Compas Proporcional, ms., 1618, Napoli, Biblioteca Nazionale, MS. I.D.I.

Coignet, Michel. La geometrie reduite en un facile et briefve pratique; par deux excellens instrumens, dont l’une est le pantometre ou compas de proportion de Michel Connette ec. L’autre est l’usage du compas a huict poinctes inventé par Fabrice Mordente ec., Parigi, Charles Hulpeau, 1626.

Meskens, Ad. Michiel Coignet’s Contribution to the Development of the Sector, in «Annals of Science», 54 (1997), 2, pp. 143-160.


Images

Coignet, Michel. De Regulae Pantometrae fabrica et usu libri septem, ms., Oxford.

Coignet, Michel. Usus duodecim divisionem regulae pantometrae, ms. 1610-1613, Firenze.

Author of the entry: Filippo Camerota

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