Graphometer

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|data= 1597
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|descrizione= Instrument described by Philippe Danfrie, which may be seen as a half [[compass]]. The magnetic needle and the [[diopter]] are found in fact at the centre of a semicircle with a degree scale, attached to a fixed base that carries sights. For measuring distances and surveying territories, the instrument requires two stations, whose alignment is verified through the sights on the fixed base. The diopter measures the position angles, which are later transcribed onto charts.  
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|descrizione= Instrument described by Philippe Danfrie, which may be seen as a half [[compass]]. The magnetic needle and the diopter are found in fact at the centre of a semicircle with a degree scale, attached to a fixed base that carries sights. For measuring distances and surveying territories, the instrument requires two stations, whose alignment is verified through the sights on the fixed base. The diopter measures the position angles, which are later transcribed onto charts.  
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Revision as of 11:27, 27 July 2010

Name derived by the inventor from the Greek grapho (to describe, to paint, to draw) and metron (measure).

Contents

Inventor

Philippe Danfrie


Historic Period

1597


Description

Instrument described by Philippe Danfrie, which may be seen as a half compass. The magnetic needle and the diopter are found in fact at the centre of a semicircle with a degree scale, attached to a fixed base that carries sights. For measuring distances and surveying territories, the instrument requires two stations, whose alignment is verified through the sights on the fixed base. The diopter measures the position angles, which are later transcribed onto charts.


Bibliographical Resources

Danfrie, Philippe. Déclaration de l'usage du graphomètre par la pratique duquel l'on peut mesurer toutes distances des choses de remarque qui se pourront voir et discerner du lieu ou il sera posé et pour arpenter terres, bois, prés et faire plans de villes et forteresses, cartes géographiques et généralement toutes mesures visibles, et ce sans règle d'arithmétique..., A Paris, chez ledict Danfrie, 1597.


Existing Instruments

Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 151.
Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 3630.
Firenze, Museo Galileo. Istituto e Museo di Storia della Scienza, Inv. 3699.



Author of the entry: Filippo Camerota

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