Four-Point Compasses

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|nome= Nome in uso attualmente per identificare il [[compasso di riduzione]].
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Name currently used for the [[Reduction Compasses | reduction compasses]].
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|descrizione= Detto anche [[compasso doppio]] o "con le punte doppie" (Muzio Oddi, ''Fabbrica et uso del compasso polimetro'', Milano 1633, proemio), lo strumento era usato come [[compasso di proporzione]], per la misura dei rapporti proporzionali semplici, o come [[compasso di riduzione]] per l’ingrandimento o riduzione dei disegni. Lo strumento era formato da due gambe incrociate con punte su tutte le estremità e perno di giuntura fisso o variabile secondo i rapporti proporzionali desiderati. Se ne conoscono anche esemplari antichi ritrovati negli scavi di Pompei.
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Also called [[Double Compasses | double compasses]] or "compass with double points" (Muzio Oddi, ''Fabbrica et uso del compasso polimetro'' [Construction and operation of the polymeter compass] Milan 1633, introduction), the instrument was used as a [[Proportional Compasses  | proportional compasses]], for measuring simple proportional ratios, or as a [[Reduction Compasses | reduction compasses]] to enlarge or reduce drawings. The compass was composed of two intersecting legs with points on all ends and a fixed or variable pivot depending on the proportional ratios desired. Ancient examples of this instrument have been found in the excavations of Pompeii.
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- Museo Galileo, Institute and Museum of the History of Science, Florence <br>
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[http://catalogue.museogalileo.it/object/FourpointProportionalCompasses.html Florence, Museo Galileo. Istituto di Storia della Scienza, inv. 3567] <br />
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|immagini= <gallery widths=230 heights=368 perrow=3>
 
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Image:
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File.jpg | Nicolas Bion. ''Traité de la construction et des principaux usages des instruments de mathematique : avec les figures necessaires pour l'intelligence de ce Traité'', Paris, 1725, tav. VIII p.70, particolare.<br />
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File.jpg | George Adams. ''Geometrical and graphical essays, containing a general description of the mathematical instruments used in geometry, civil and military surveying, levelling and perspective : with many new practical problems''. London, 1813., tav. I, particolare.<br />
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|autore_scheda= Filippo Camerota
|autore_scheda= Filippo Camerota

Current revision as of 14:09, 7 September 2010

Name currently used for the reduction compasses.


Description

Also called double compasses or "compass with double points" (Muzio Oddi, Fabbrica et uso del compasso polimetro [Construction and operation of the polymeter compass] Milan 1633, introduction), the instrument was used as a proportional compasses, for measuring simple proportional ratios, or as a reduction compasses to enlarge or reduce drawings. The compass was composed of two intersecting legs with points on all ends and a fixed or variable pivot depending on the proportional ratios desired. Ancient examples of this instrument have been found in the excavations of Pompeii.


Existing Instruments

- Museo Galileo, Institute and Museum of the History of Science, Florence
Florence, Museo Galileo. Istituto di Storia della Scienza, inv. 3567


Author of the entry: Filippo Camerota

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